13-Oxa-2.5.11-triazapentadecanoic acid. 3-[(3.5-dibromo4-hydroxyphenyl)methyl]-14.14-dimethyl-4.12-dioxo-6-[[4-(4-pyridinyl)-1-piperazinyl]carbonyl]-. 9H-fluoren-9-ylmethyl ester. [R-(R*.S*)]- (9CI)