C=C=CCOc1cc2c(c3c1CC1C(C)COC1(C)O3)CC1C(C)COC1(C)O2	11-buta-2,3-dienoxy-4,7,15,18-tetramethyl-3,5,14,16-tetraoxapentacyclo[11.7.0.02,10.04,8.015,19]icosa-1,10,12-triene