2-[2,3-bis(carboxymethoxy)phenoxy]acetic acid

3,4-Dihydroxy-7,8,9,10-tetrahydro-6H-benzo[c]-chromen-6-one

6,7-dihydroxy-2,3-dihydro-1H-cyclopenta[c]chromen-4-one

1,3,5,6-tetrahydroxyxanthen-9-one

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