Try searching for...
SCFBio, IIT Delhi
Formula: C20H12O7 | Mol. Weight: 364.30 g/mol
IUPAC: 8,9-dihydroxy-3-[(E)-2-(4-hydroxyphenyl)ethenyl]pyrano[4,3-c]isochromene-1,6-dione
C1=CC(=CC=C1C=CC2=CC3=C(C4=CC(=C(C=C4C(=O)O3)O)O)C(=O)O2)O