(1S,2R,5R,6S,7R,8S,9S,10R,12R,13R,17S)-6,12-Bis-benzyloxy-5-ethyl-7,9-dihydroxy-2,6,8,10,12,15,15,17-octamethyl-4,14,16-trioxa-bicyclo[11.3.1]heptadecan-3-one

(3aR,4R,7R,8S,9S,10R,11R,13R,15R,15aR)-11-Benzyloxy-4-ethyl-8,10-dihydroxy-3a,7,9,11,13,15-hexamethyl-2-phenyl-decahydro-1,3,5-trioxa-cyclopentacyclotetradecene-6,14-dione