(6S,9R,12S)-methyl 6-((R)-3-(benzoyloxy)-2-methylpropyl)-12-((R)-methoxy(phenyl)methyl)-2,2,5,9-tetramethyl-4,7,10-trioxo-3-oxa-5,8,11-triazatridecan-13-oate

methyl (6R,8S,11R,14S)-8-((tert-butoxycarbonyl)(methyl)amino)-14-((R)-methoxy(phenyl)methyl)-2,2,6,11-tetramethyl-9,12-dioxo-3,3-diphenyl-4-oxa-10,13-diaza-3-silapentadecan-15-oate