[2-BENZYL-6A-HYDROXY-8,10-DIMETHYL-7-OXO-11A-(PROP-1-EN-2-YL)-3A,6,6A,7,9A,10,11,11A-OCTAHYDRO-3BH-2,9B-EPOXYAZULENO[4',5':5,6]BENZO[1,2-D][1,3]DIOXOL-5-YL]METHYL(4-BUTOXYPHENYL)ACETATE