(2R,5S,5aR,5bS,12R,12aS,15R)-2-isopropyl-5,7,12,14-tetramethyl-9-(1-methylethylidene)-3,6,10-trioxo-1,2,3,4,5,6,8,9,10,11,12,13-dodecahydro-5bH-5a,13-methanocyclohepta[5,6]benzo[1,2-c]azulen-15-yl rel 8H-5a,13-methanocyclohepta[5,6]benz[1,2-c]azulene-3,6,10(2H,5bH)-trione, 15-(acetyloxy)-1,4,5,9,11,12,13-heptahydro-5,7,12,14-tetramethyl-2-(1-methylethyl)-9-(1-methylethylidene)-, (2R,5S,5aR,5bS,12R, InChI=1/C32H42O5/c1-14(2)21-12-23-18(7)27-30(37-20(9)33)32(23,17(6)11-26(21)35)29-28(36)19(8)24-13-22(15(3)4)25(34)10-16(5)31(24,27)29/h14,16-17,21,27,29-30H,10-13H2,1-9H3/t16-,17+,21-,27?,29+,30-,31+,32+/m1/s Vielanin A