(2S,5R,7S,9S,10S,12R)-2-((2R,5R,6S)-5-Ethyl-6-methyl-5-triethylsilanyloxy-tetrahydro-pyran-2-yl)-2,10,12-trimethyl-9-((S)-1-triethylsilanyloxymethyl-propyl)-1,6,8-trioxa-dispiro[4.1.5.3]pentadec-13-en-15-one

Acetic acid (2S,5R,7S,9S,10S,12R,15R)-2-((2R,5R,6S)-5-ethyl-6-methyl-5-triethylsilanyloxy-tetrahydro-pyran-2-yl)-9-((R)-1-ethyl-2-oxo-butyl)-2,10,12-trimethyl-1,6,8-trioxa-dispiro[4.1.5.3]pentadec-13-en-15-yl ester