3,7-Dihydroxy-3',6'-dimethoxy-2'-methylspiro(benzofuran-2(3H),1'-(2,5)cyclohexadiene)-4'-one 52972-07-3 Spiro(benzofuran-2(3H),1'-(2,5)cyclohexadiene)-4'-one, 3,7-dihydroxy-3',6'-dimethoxy-2'-methyl-