Try searching for...
SCFBio, IIT Delhi
Formula: C19H16O10 | Mol. Weight: 404.30 g/mol
IUPAC: (2S,3S,4S,5R,6S)-3,4,5-trihydroxy-6-(8-hydroxy-6-oxobenzo[c]chromen-3-yl)oxyoxane-2-carboxylic acid
C1=CC2=C(C=C1O)C(=O)OC3=C2C=CC(=C3)OC4C(C(C(C(O4)C(=O)O)O)O)O