188640-74-6 3,4,7,8,9,10a-Hexakis(acetyloxy)-2,2,9,12-tetramethyl-6-methylene-11-oxotetradecahydro-1aH-cyclopenta[5,6]cyclododeca[1,2-b]oxiren-5-yl 2-methylpropanoate AIDS-148941 AIDS148941 NSC682342