2-Butenoic acid, 2-methyl-, (2R,3aS,6aR,6bR,7S,9R,9aR,11aR,11bR,12S,12aR)-7,9-bis(acetyloxy)-2-(3-furanyl)-3,3a,6,6a,6b,7,8,9,9a,10,11a,11b,12,12a-tetradecahydro-1,6b,9a,12a-tetramethyl-5-oxo-2H,5H-cyclopent(a)isobenzofuro(7,1-gh)(3)benzoxepin-12-yl ester, (2E)- 71902-49-3