1,3-Dihydroxy-7-methoxy-9H-xanthen-9-one 1,3-Dihydroxy-7-methoxyxanthen-9-one 491-64-5 5-18-04-00497 (Beilstein Handbook Reference) 9H-Xanthen-9-one, 1,3-dihydroxy-7-methoxy- (9CI) BRN 0258402 CCRIS 3969 Isogentisin Isogentisine Xanthen-9-one, 1,3-dihydroxy-7-methoxy-