CAS No 992-20-1 , (2aR,3R,5S,5aR,6S,6aR,8R,9aR,10aS,10bR,10cR)-3-(acetyloxy)-8-furan-3-yl-6-(2-methoxy-2-oxoethyl)-2a,5a,6a,7-tetramethyl-2a,4,5,5a,6,6a,8,9,9a,10a,10b,10c-dodecahydro-2H,3H-cyclopenta[d]naphtho[2,3-b:1,8-b'c']difuran-5-yl (2E)-2-methylbut-2-enoate