This invention relates to deuterated forms of venetoclax, and pharmaceutically acceptable salts thereof. Certain aspects of this invention also provide pharmaceutical compositions comprising a compound of the present invention and a pharmaceutically acceptable carrier. Certain aspects of the present invention also provide the use of such compounds and compositions in methods of treating diseases and conditions that are beneficially treated by administering an inhibitor of the anti-apoptotic activity of the B-cell lymphoma 2 (Bcl-2) protein.