Synonyms: Altenuicacid II (6CI,8CI); Spiro[furan-3(2H),1'(3'H)-isobenzofuran]-2-acetic acid,4,5-dihydro-4'-hydroxy-6'-methoxy-2-methyl-3',5-dioxo-, trans-(?à)-;Spiro[furan-3(2H),1'(3'H)-isobenzofuran]-2-acetic acid,4,5-dihydro-4'-hydroxy-6'-methoxy-2-methyl-3',5-dioxo-, trans-