(+-)-2-((3-Amino-2,6-dioxo-1-piperidinyl)carbonyl)benzoic acid 40548-80-9 Benzoic acid, 2-((3-amino-2,6-dioxo-1-piperidinyl)carbonyl)-, (+-)- N-(o-Carboxybenzoyl)-DL-glutamic acid imide o-Carboxybenzoyl-glutamic acid imide