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                           September 1, 2021

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

                                                        Re: Mountain Crest
Acquisition Corp II
                                                            Amendment No. 2 to
Registration Statement on Form S-4
                                                            Filed August 12,
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.

       Amendment No. 2 to Registration Statement on Form S-4 filed August 12,
2021

       Better Therapeutics, Inc. , page 17

   1.                                                   We note your revised
disclosure on page 171 in response to prior comment 2 and reissue
                                                        in part. Please revise
your disclosure to specify the number of interviewees who
                                                        "responded favorably"
to the target product profile at each of the pricing ranges, or
                                                        advise. With reference
to your disclosure at the bottom of page 184, please revise the
                                                        disclosure on page 17
to highlight your current plan to set pricing for BT-001 at a
                                                        moderate discount to
branded, oral glycemic control medications.
       Risk Factors, page 37

   2.                                                   We note your response
to prior comment 14 and revised risk factor disclosure on page 46
 Suying Liu, Ph.D.
Mountain Crest Acquisition Corp II
September 1, 2021
Page 2
       regarding the real world use study of BT-001 that BTX and Steward Health
Care Network
       formerly had planned to conduct in 2021 pursuant to a collaboration
agreement. With a
       view to revised disclosure on page 184, please tell us whether this
development negatively
       impacts your ability to optimize payer reimbursement coverage at or
immediately
       following the time you hope to launch BT-001.


Key findings of the pilot study, page 163

3.     We note the revised disclosure on pages 164 and 170 in response to prior
comment 7.
       You state that while the pilot study of BT-001 was not designed as a
head-to-head
       comparison of BT-001 to oral medications, the data from the pilot
"compare favorably to
       historical published data." As it is unclear to what historical
published data you refer,
       please identify the relevant research studies.
General

4.     Please advise as to why you have deleted the Principal Stockholders of
MCAD table that
       formerly appeared on page 150 of the registration statement. Refer to
Item 6(d) of
       Schedule 14A and Item 403 of Regulation S-K.
        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
Lauren Hamill at 303-844-1008 or Joe McCann at 202-551-6262 with any other
questions.



                                                            Sincerely,
FirstName LastNameSuying Liu, Ph.D.
                                                            Division of
Corporation Finance
Comapany NameMountain Crest Acquisition Corp II
                                                            Office of Life
Sciences
September 1, 2021 Page 2
cc:       Andrei Sirabionian, Esq.
FirstName LastName