(8S,11S,12R)-11-((S)-sec-Butyl)-1-(9H-fluoren-9-yl)-8-isopropyl-12-methoxy-5,5,10-trimethyl-3,6,9-trioxo-2-oxa-4,7,10-triazatetradecan-14-oic acid

(8S,11S,12R)-11-((S)-sec-Butyl)-1-(9H-fluoren-9-yl)-8-isopropyl-12-methoxy-5,5,10-trimethyl-3,6,9-trioxo-2-oxa-4,7,10-triazatetradecan-14-oic acid,