Try searching for...
SCFBio, IIT Delhi
Formula: C21H20O11 | Mol. Weight: 448.40 g/mol
IUPAC: 2-(3,4-dihydroxyphenyl)-5,7-dihydroxy-8-[(2R,3S,4S,5R,6S)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]chromen-4-one
C1=CC(=C(C=C1C2=CC(=O)C3=C(O2)C(=C(C=C3O)O)C4C(C(C(C(O4)CO)O)O)O)O)O