malonic acid 3-acetoxy-6a,9-bis(2-methoxycarbonylacetoxy)-6,6a,7,11b-tetrahydroindeno(2,1-c)chromen-10-yl ester methyl ester
malonic acid 3-acetoxy-6a,9-bis(2-methoxycarbonylacetoxy)-6,6a,7,11b-tetrahydroindeno(2,1-c)chromen-10-yl ester methyl ester