United States securities and exchange commission logo





                             May 23, 2021

       Suying Liu
       Chief Executive Officer
       Mountain Crest Acquisition Corp II
       311 West 43rd Street
       12th Floor
       New York, NY 10036

                                                        Re: Mountain Crest
Acquisition Corp II
                                                            Registration
Statement on Form S-4
                                                            Filed April 23,
2021
                                                            File No. 333-255493

       Dear Dr. Liu:

              We have reviewed your registration statement and have the
following comments. In
       some of our comments, we may ask you to provide us with information so
we may better
       understand your disclosure.

              Please respond to this letter by amending your registration
statement and providing the
       requested information. If you do not believe our comments apply to your
facts and
       circumstances or do not believe an amendment is appropriate, please tell
us why in your
       response.

              After reviewing any amendment to your registration statement and
the information you
       provide in response to these comments, we may have additional comments.

       Registration Statement on Form S-4 filed April 23, 2021

       Better Therapeutics, Inc., page 16

   1.                                                   Please revise the
second paragraph under the heading to clarify that none of the company's
                                                        products are FDA
approved. Similarly, revise your statement in the third paragraph that
                                                        you "expect" FDA
authorization of BT-001 in late 2022. In this regard, you should not
                                                        suggest or imply that
the product will be approved by FDA. Please revise your disclosure
                                                        here and any similar
statements throughout the prospectus accordingly.
   2.                                                   Please revise here to
clarify the disease treatment claim for which you seek FDA
                                                        approval. In this
regard, we note that your disclosure on page 16 indicates that
                                                        your prescription
digital therapeutics are designed to promote "changes in neural
 Suying Liu
Mountain Crest Acquisition Corp II
May 23, 2021
Page 2
         pathways of the brain" so that "lasting changes in behavior" can
become possible;
         however, your diabetes studies and trials, as discussed in your
Business section, do not
         appear to: (i) measure or assess neural pathway changes or (ii) assess
behavioral changes
         beyond limited durations (i.e., three to six months).
3.       We note your disclosure in this section and elsewhere throughout your
registration
         statement that you are currently enrolling patients in a "pivotal"
trial for BT-001 for the
         treatment of patients with type 2 diabetes. Please revise the
disclosure to make it clear that
         even if you receive positive data from this trial, the U.S. Food and
Drug Administration
         (FDA) or other regulators may require you to conduct additional trial
or not agree with
         your trial design.
4.       We note your disclosure here that you have "conducted primary market
research
         establishing the potential for widespread reimbursement coverage of
our lead product
         candidate by representative payer groups." However, we note your risk
factor disclosure
         on pages 60 and 61 indicates that CMS is the principal decision-maker
with respect to
         reimbursements and that there is "significant uncertainty related to
the insurance coverage
         and reimbursement of newly approved products". Accordingly, please
revise your
         disclosure on page 16 to provide additional support and context or
remove the claim.
         Also, expand your disclosure on page 174-175 to explain how CMS
factors into your
         efforts to achieve reimbursement coverage.
The Board of Directors' Reasons for Approval of the Business Combination, page
21

5.       Please revise to further explain and clarify the Board's belief that
BTX has a first mover
         advantage. For instance, the disclosure should clarify that the "early
studies" are distinct
         from clinical trials. Also the "demonstrating clinical benefit" claim
should be
         explained given that BTX has not yet conducted clinical trials and has
not received FDA
         approval for any of it products. With reference to your disclosures on
page 41 and 164,
         please tell us, and revise as applicable to discuss, whether/how the
Board considered
         BTX's intellectual property position when assessing BTX's competitive
positioning.
Clear development path for the company's lead candidate. , page 23

6.       Please clarify what you mean when you state there is a "[c]lear
development path for the
         company   s lead candidate" and that "Better Therapeutics has aligned
with the regulators
         on the pivotal clinical trial design."
Ownership of the Post-Business Combination Company After the Closing, page 24

7.     We note your disclosure in the table at the top of page 25 showing "100%
redemption (or
FirstName LastNameSuying Liu
       $0 in trust)." However, we note your disclosure elsewhere that the
maximum redemption
Comapany   NameMountain
       amount               Crest Acquisition
                requires a minimum             Corp
                                    trust account    II
                                                  balance  of $5,000,001, after
giving effect to the
May 23,payments
         2021 Pageto redeeming
                      2        stockholders. Please revise or advise.
FirstName LastName
 Suying Liu
FirstName  LastNameSuying  Liu II
Mountain Crest Acquisition Corp
Comapany
May        NameMountain Crest Acquisition Corp II
     23, 2021
May 23,
Page 3 2021 Page 3
FirstName LastName
Risks Related to the Combined Entity and the Business Combination
The Combined Entity's amended and restated certificate of incorporation will
provide that the
Court of Chancery of the State of Delaware..., page 76

8.       We note your disclosure here that the Combined Entity's amended and
restated certificate
         of incorporation will contain various exclusive forum provisions.
However, we note your
         disclosure on page 117 where you state that the proposed certificate
of incorporation for
         the Combined Entity will not have a choice of forum provision and it
appears that the
         choice of forum provision will be in your amended and restated bylaws
of the Combined
         Entity. Please revise your disclosure or otherwise advise.
Net Loss Per Share, page 93

9.       Please revise the table to separately disclose the number of shares
that the BTX SAFEs are
         expected to be converted into.
10.      Please also state here how many rights are currently outstanding, and
whether you have
         included them in the calculation of the basic weighted average shares
outstanding here.
Certain Unaudited BTX Prospective Financial Information, page 100

11.      Please revise to disclose the material assumptions supporting the
large projected revenue
         increases in 2026 and 2027.

Interests of MCAD's Directors and Officers and Others in the Business
Combination, page 105

12.      We note disclosure here and elsewhere, including in your risk factors,
regarding conflicts
         of interest in circumstances where the founder shares become worthless
without an initial
         business combination. Please disclose in quantitative and qualitative
terms how economic
         incentives could result in substantial misalignment of interests where
an initial business
         combination does occur. For example, since your sponsor acquired a 20%
stake for
         approximately $0.017 per share and the merger consideration is based
on a deemed price
         per share of $10.00 a share, the insiders could make a substantial
profit after the initial
         business combination even if public investors experience substantial
losses. Please revise
         here and your risk factors accordingly.
Sources and Uses for the Business Combination, page 106

13.      We note your table appears to disclose that cash consideration will be
paid to BTX
         Equityholders. However, elsewhere your disclosure states that "Merger
Consideration" is
         "15,000,000 shares of MCAD   s common stock, par value $0.0001 per
share
         (   MCAD Common Stock   ), subject to adjustment." Please update this
apparent
         inconsistency or otherwise advise.
 Suying Liu
FirstName  LastNameSuying  Liu II
Mountain Crest Acquisition Corp
Comapany
May        NameMountain Crest Acquisition Corp II
     23, 2021
May 23,
Page 4 2021 Page 4
FirstName LastName

Certain Material U.S. Federal Income Tax Consequences of Exercising Redemption
Rights, page
109

14.      Please have counsel provide an opinion concerning the consequences to
U.S. holders of
         exercising their redemption rights. For additional guidance concerning
assumptions and
         opinions subject to uncertainty, refer to Staff Legal Bulletin No. 19.
Conflicts of Interest, page 140

15.      Please revise to clarify and quantify Chardan's financial interests in
consummating the
         merger. With reference to the disclosure on page F-7, please be sure
to address deferred
         underwriting compensation, financial advisory fees and any other value
that Chardan is
         eligible to receive if the merger is consummated. Also, revise the
Background of the
         Merger section to clarify MCAD reason(s) for engaging Chardan after
the term sheet with
         BTX had been executed. In this regard, we do not see any additional
references in the
         Background section concerning Chardan's provision of advisory
services.
Information About BTX, page 149

16.      Please revise the Business section to explain the company's plan for
the SPAC merger and
         PIPE funds. In this regard, please discuss your plans for funding your
lead candidate(s);
         building your sales, marketing and distribution infrastructure; and
obtaining
         reimbursement coverage.
BTX's Solution, page 150

17.      We note your disclosure here that your pilot study of BTX's BT-001
"resulted in clinically
         meaningful improvement in glycemic control" and similar statements
throughout the
         document, including, as example only, your references to "[BT-001's]
strong efficacy
         signal," "BT-001 demonstrating clinical benefit" and "BTX demonstrated
comparable
         efficacy in lowering A1c to orally administered medications with fewer
side
         effects." Safety and efficacy are determinations that are solely
within the authority of the
         U.S. Food and Drug Administration (FDA) or similar foreign regulators.
You may present
         clinical trial end points and objective data resulting from trials
without concluding
         efficacy. Please revise these and similar statements here and
throughout the document.
18.      Please expand your disclosure on page 151 and/or 155 to clarify how
your PDT product
         candidates will be used "under the guidance of a physician."
19.      Please revise to clarify how many digital prescription therapeutics
have received FDA
         approval or clearance to make disease treatment claims. Discuss the
regulatory
         pathway these therapeutics have followed and whether they presently
are reimbursed like
         they were a drug. Also indicate whether any such approved/cleared
therapeutics have
         focused on nutrition or instead focused on other other behaviors
and/or addictions. Revise
         the disclosure on page 16, as applicable.
 Suying Liu
FirstName  LastNameSuying  Liu II
Mountain Crest Acquisition Corp
Comapany
May        NameMountain Crest Acquisition Corp II
     23, 2021
May 23,
Page 5 2021 Page 5
FirstName LastName
Platform Leverage, page 153

20.      Please revise your statement that you have "the potential to develop a
portfolio of PDTs
         for some of the most prevalent diseases in the U.S. at a fraction of
the time and cost of
         traditional therapeutics" and your similar statements on page 154
that, "BTX expects to
         rapidly develop and, if approved, commercialize multiple product
candidates" and
         "expedited FDA review process" for your product candidates. Clinical
development is
         a lengthy process and indications that you will be successful in
developing your product
         candidates in a rapid or accelerated manner is speculative.
BTX's Pipeline, page 154

21.      Please shorten the length of the shading for the clinical studies that
are not yet completed
         in the pipeline table on page 154. For example only, BT-001 needs to
be shortened, given
         the disclosure on page 157 indicates the trial is still ongoing and
topline data is not
         expected until Q4 2021. In addition, it appears that your length of
shading needs to be
         shortened since you have not completed a pilot study for BT-002,
BT-003, BT-004 and
         BT-005.
Key Findings of the Pilot Study, page 155

22.      Revise to disclose the p values and indicate whether each reported
trial result was
         statistically significant. We also note your disclosure in the chart
on page 156 that, "[t]he
         FDA approvable endpoint is a reduction in A1c of -0.4% compared to
control after 12
         weeks of treatment." Please explain what you specifically mean by this
statement as well
         as stating your basis for making this claim, including whether or not
you have had
         discussions with FDA.
Pivotal study of BT-001, page 157

23.      Please revise to clarify the 3 month and 6 month efficacy endpoints.
In this regard, please
         revise to disclose the quantitative reduction at the end of each
period or advise. Also,
         disclose the safety endpoints.
24.      We note your risk factor disclosure on page 51 where you state that
your pivotal study of
         BT-001 is a "virtual clinical trial." Please clarify your disclosure
here to discuss the
         specific aspects of your trial that are "virtual."
BTX Payer Research, page 175

25.      Please define or explain any technical terms or abbreviations the
first time they are used.
         For example only, please define the term "T2D" in your graphic on page
175.
Employment Agreements with BTX's Named Executive Officers, page 183

26.      We note that in connection with the Business Combination you have
entered into offer
         letters with each of the named executive officers and a new employment
agreement with
 Suying Liu
Mountain Crest Acquisition Corp II
May 23, 2021
Page 6
      Mr. Appelbaum. Please file the employment agreement and offer letters of
each of your
      executive officers as an exhibit to the registration statement. See Item
601(b)(10) of
      Regulation S-K. In addition, please revise your disclosure to include the
all material terms
      of the agreements, including compensation.
BTX Financial Statements
Note 10. Fair Value Measurements, page F-32

27.   Here and at page 205, you referred to assumptions and estimates for the
SAFE valuation.
      Please revise to disclose the quantitative information about the
significant unobservable
      inputs used in the fair value measure as required ASC 820-10-50-2(bbb).

General

28.   Please revise your graphics throughout your registration statement as
applicable to ensure
      that the text is legible. For example, the text in your pipeline table
and the text in the
      graphic on page 176, including the source, are unclear and difficult to
read.
        We remind you that the company and its management are responsible for
the accuracy
and adequacy of their disclosures, notwithstanding any review, comments, action
or absence of
action by the staff.

       Refer to Rules 460 and 461 regarding requests for acceleration. Please
allow adequate
time for us to review any amendment prior to the requested effective date of
the registration
statement.

       You may contact Li Xiao at (202) 551-4391 or Daniel Gordon at (202)
551-3486 if you
have questions regarding comments on the financial statements and related
matters. Please
contact Jason Drory at (202) 551-8342 or Joe McCann at (202) 551-6262 with any
other
questions.



                                                            Sincerely,
FirstName LastNameSuying Liu
                                                            Division of
Corporation Finance
Comapany NameMountain Crest Acquisition Corp II
                                                            Office of Life
Sciences
May 23, 2021 Page 6
cc:       Andrei Sirabionian
FirstName LastName