(7S,8Z,10S,11S,12S,13Z,16S,17R)-17-((2R,3S,4S)-3-(carbamoyloxy)-4-methyloctan-2-yl)-11-(methoxymethoxy)-2,2,3,3,10,12,14,16,19,19,20,20-dodecamethyl-4,18-dioxa-3,19-disilahenicosa-8,13-dien-7-yl (R)-2-methoxy-2-phenylacetate