Try searching for...
SCFBio, IIT Delhi
Formula: C16H14O9S | Mol. Weight: 382.30 g/mol
IUPAC: 5,7-dihydroxy-2-(4-hydroxyphenyl)-6-methoxy-4-oxo-2,3-dihydrochromene-8-sulfonic acid
COC1=C(C(=C2C(=C1O)C(=O)CC(O2)C3=CC=C(C=C3)O)S(=O)(=O)O)O