1,3-Dioxolo[4,5-c]pyrrole-5-carboxylic acid, tetrahydro-2,2-dimethyl-4-[[4-(1,1-dimethylethoxy)- 2-[(2-propenoxy)carbonyl]-1-pyrrolidinyl]carbonyl]-,[(9H-fluoren-9-yl)methyl] ester 5H-1,3-Dioxolo[4,5-c]pyrrole-5-carboxylic acid, 4-[[4-(1,1- dimethylethoxy)-2-[(2-propenoxy)carbonyl- 1-pyrrolidinyl] carbonyl]-tetrahydro-2,2-dimethyl-, [(9H-fluoren-9-yl) methyl]ester, stereoisomer NSC713587