133806-61-8 5-1''-Acetoxy-6'-formyl-4-methoxy-4'-methyl-3''-methylbutyl-spiro(benzofuran-2,1'-cyclohexa-3',5'-diene)-2',3(2H)-dione Purpactin C Spiro(benzofuran-2(3H),1'-(2,4)cyclohexadiene)-3,6'-dione, 5-(1-(acetyloxy)-3-methylbutyl)-2'-formyl-4-methoxy-4'-methyl-