Try searching for...
SCFBio, IIT Delhi
Formula: C13H8O5 | Mol. Weight: 244.20 g/mol
IUPAC: 8-hydroxy-6-methoxybenzo[f][1]benzofuran-4,9-dione
COC1=CC2=C(C(=C1)O)C(=O)C3=C(C2=O)C=CO3