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| Other names | TS-121; TS121; TS-1211; TS1211; THY1773; THY-1773; ANC-501; ANC501 |
| Routes of administration | By mouth |
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| Formula | C25H30ClN5O3 |
| Molar mass | 484.00 g·mol−1 |
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Brezivaptan (developmental code names ANC-501, THY-1773, TS-121) is an orally active, selective vasopressin V1B receptor antagonist which is under development by Taisho Pharmaceutical for the adjunctive treatment of major depressive disorder. As of November 2022, it is in phase II clinical trials for this indication.