1-[4-(benzoyl)piperazin-1-yl]propan-1-one 1-[4-(oxo-phenylmethyl)-1-piperazinyl]propan-1-one 1-(4-phenylcarbonylpiperazin-1-yl)propan-1-one EU-0100340 D5689_SIGMA DM 235 Lopac-D-5689 NCGC00015350-01 Lopac0_000340