1,3-Dihydro-1,3-dioxo-2H-isoindole-2-acetic acid compd. with piperazine (2:1) 1,3-Dioxo-2H-isoindoline-2-acetic acid piperazine (salt) 2H-Isoindole-2-acetic acid, 1,3-dihydro-1,3-dioxo-, compd. with piperazine (2:1) 58248-05-8