[[[(1R)-7-Ethenyl-1,2,3,4,4a,4bα,5,6,7,9,10,10aα-dodecahydro-1α,4aβ,7β-trihydroxyphenanthren]-1-ylcarbonyl]oxy]tributylstannane

[1R-(1alpha,4a.beta.,4b.alpha.,7beta,10a.alpha.)]-tributyl[[(-1,2,3,4,4a,4b,5,6,7,9,10,10a-dodecahydro-1,4a,7-trihydroxy-7-vinyl-1-phenanthryl)carbonyl]oxy]stannane