5,7-Dichloro-5',6'-dihydroxy-6'-methoxy-4-methyl-3,4-dioxospiro(benzofuran-2(3H)-1'-(2,5)-cyclohexadiene)-2-carboxylic acid methyl ester 94663-91-9 Gillusdin Spiro(benzofuran-2(3H),1'-(2,5)cyclohexadiene)-2'-carboxylic acid, 5,7-dichloro-5',6-dihydroxy-6'-methoxy-4-methyl-3,4'-dioxo-, methyl ester