2-(2,4-dioxopentyl)-2,5,7-trihydroxy-2,3-dihydrobenzopyran-4-one

1-羟基-3,6-二甲氧基-8-甲基-9H-氧杂蒽-9-酮

1,3,6-三甲氧基-8-甲基-9H-氧杂蒽-9-酮

1,3,6-trimethoxy-8-methyl-xanthene