Baccatin I

(1S,4R)-2,3,4aα,5,6,7,8,11,12,12a-Decahydro-9,12aβ,13,13-tetramethylspiro[6α,10-methanobenzocyclodecene-4(1H),2'-oxirane]-1β,3α,5α,8α,11β,12α-hexol hexaacetate