(1AR,1BS,4AR,7AS,7BR,8R,9AS)-4A,7B-DIHYDROXY-3-(HYDROXYMETHYL)-1,1,6,8-TETRAMETHYL-5-OXO-1,1A,1B,4,4A,5,7A,7B,8,9-DECAHYDRO-9AH-CYCLOPROPA[3,4]BENZO[1,2-E]AZULEN-9A-YL 2-METHYLBUTANOATE