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Acetic acid (2S,4aS,4bS,6R,6aS,6bS,9aS,10aS,10bR,12aS)-2-acetoxy-4a,6a,7-trimethyl-8-[(R)-3-methyl-4-(toluene-4-sulfonyloxy)-butyl]-2,3,4,4a,4b,5,6,6a,6b,9a,10,10a,10b,11,12,12a-hexadecahydro-1H-9-oxa-pentaleno[2,1-a]phenanthren-6-yl ester