The chemical OPC 21268 has a designated molecular formula of C26H31N3O4 and a molecular weight of 449.551 g/mol. Synonyms may include: 1-(1-(4-(3-Acetylaminopropoxy)benzoyl)-4-piperidyl)-3,4-dihydro-2(1H)-quinolinone, OPC 21268 (ChemID). OPC 21268 has been assigned a MeSH pharmacological action of: Antidiuretic Hormone Receptor Antagonist.