1-Methoxy-2,3,7,8-dimethylenedioxyxanthone 11-methoxy-12H-bis[1,3]dioxolo[4,5-a:4',5'-i]xanthen-12-one 12H-1,3-dioxolo[4,5-a][1,3]dioxolo[4,5-i]xanthen-12-one, 11-methoxy- InChI=1/C16H10O7/c1-18-16-12-9(4-10-15(16)22-6-20-10)23-7-2-3-8-14(21-5-19-8)11(7)13(12)17/h2-4H,5-6H2,1H