| | (25R,52S)-52-((((9H-Fluoren-9-yl)methoxy)carbonyl)amino)-25-(tert-butoxycarbonyl)-2,2-dimethyl-4,23,28,37,46-pentaoxo-3,32,35,41,44-pentaoxa-24,29,38,47-tetraazatripentacontan-53-oic acid CAS:2460751-66-8 CM1075331 CC(C)(C)OC(=O)CCCCCCCCCCCCCCCCCCC(=O)N[C@H](CCC(=O |