(2S,2'S,3a'S,7a'R,10a'R,10b'R,13'S,14a'R,14b'S)-13'-hydroxy-6',9',9',10b',15',15'-hexamethyl-2'-phenyl-7a',10a',10b',11',12',13',14a',14b'-octahydrospiro[oxirane-2,14'-[3a,7]methanobenzo[3,4]cyclodeca[1,2-d:5,6-d']bis([1,3]dioxole)]-5'(4'H)-one

(2S,3aS,5S,7aR,10aR,10bR,14aR,14bS)-6,9,9,10b,15,15-hexamethyl-2-phenyl-5-((triethylsilyl)oxy)-4,5,7a,10a,10b,11,12,13,14a,14b-decahydro-14H-3a,7-methanobenzo[3,4]cyclodeca[1,2-d:5,6-d']bis([1,3]dioxole)-14-one

1,2-O-benzylidene-4,20-dihydro-4α,20-dihydroxy-5-O-mesyl-20-O-terbutyldimethylsilyl taxicine I