Chemical Name : (2aR,4S,4aS,6R,9S,11S,12S,12aR,12bS)-1,2a,3,4,4a,6,9,10,11,12,12a,12b-Dodecahydro-4,6,9,11,12,12b-hexahydroxy-4a,8,13,13-tetramethyl-7,11-methano-5H-cyclodeca[3,4]benz[1,2-b]oxet-5-one 12b-acetate, 12-[(E)-2-methylbut-2-enoate], 9-ester with (2R,3S)-N-tert- butoxycarbonyl-3-phenylisoserine