A1EIM a1eim methyl (4aS,6aR,6bS,8aR,12aS,14aS,14bS}-11-cyano-2,2,6a,6b,9,9,12a-heptamethyl-10,14-bis(oxidanylidene)-1,3,4,5,6,7,8,8a,14a,14b-decahydropicene-4a-carboxylate A1EIM