Try searching for...
SCFBio, IIT Delhi
Formula: C15H11O6+ | Mol. Weight: 287.24 g/mol
IUPAC: 5-(5,7-dihydroxychromenylium-2-yl)benzene-1,2,3-triol
C1=CC(=[O+]C2=CC(=CC(=C21)O)O)C3=CC(=C(C(=C3)O)O)O