1,3,7-Trihydroxyxanthone 5-18-04-00497 (Beilstein Handbook Reference) 529-49-7 9H-Xanthen-9-one, 1,3,7-trihydroxy- BRN 0384687 CCRIS 4008 Gentisein NSC 329491 XANTHONE DERIV Xanthen-9-one, 1,3,7-trihydroxy-