Try searching for...
SCFBio, IIT Delhi
Formula: C13H8O6 | Mol. Weight: 260.20 g/mol
IUPAC: 2,3,5,7-tetrahydroxyxanthen-9-one
C1=C(C=C(C2=C1C(=O)C3=CC(=C(C=C3O2)O)O)O)O