Zentalis Pharmaceuticals, Inc., a clinical-stage biopharmaceutical company, focuses on discovering and developing small molecule therapeutics for the treatment of various cancers in the United States. It develops azenosertib, which is in a Phase 3 clinical trial for the treatment of ovarian cancer and other tumor types. The company also develops ZN-c3-001, a phase 1 study that evaluated azenosertib monotherapy in solid tumors; and MAMMOTH (ZN-c3-006) is a Phase 1/2 clinical trial of azenosertib in patients with PARP-inhibitor resistant ovarian cancer. It has licensing agreements and strategic collaborations with Recurium IP Holdings, LLC. Zentalis Pharmaceuticals, Inc. was incorporated in 2014 and is based in San Diego, California.