United States Pharmacopeia (USP) Reference Standard Synonym(s): 2-{3-[4-(4-Chlorophenyl)-1-piperazinyl]propyl}-5-ethyl-2,4-dihydro-4-(2-phenoxyethyl)-3 H -1,2,4-triazol-3-one hydrochloride Empirical Formula: C25H32ClN5O2 -+ HCl Formula Weight: 506.47...