Try searching for...
SCFBio, IIT Delhi
Formula: C18H16O10S | Mol. Weight: 424.40 g/mol
IUPAC: [5-hydroxy-6,7-dimethoxy-2-(4-methoxyphenyl)-4-oxochromen-3-yl] hydrogen sulfate
COC1=CC=C(C=C1)C2=C(C(=O)C3=C(C(=C(C=C3O2)OC)OC)O)OS(=O)(=O)O