(4',5',6'-triacetyloxy-3-oxospiro[2-benzofuran-1,9'-xanthene]-3'-yl) acetate

2-(3,4,5,6-tetrahydroxy-9H-xanthen-9-yl)benzoic acid

草酸

邻苯二甲酸

9H-Xanthen-9-one, 3,4,5,6-tetrahydroxy-