9-[2-carboxy-5-(2,5-dihydro-2,5-dioxo-1H-pyrrol-1-yl)phenyl]-3,6-bis(dimethylamino)-xanthylium, inner salt
2-(Benzoylamino)-5,6,7,8-tetrahydro-7,7-dimethyl-5-oxo-4–methyl-4H-1-benzopyran-3-carboxylic acid methyl ester