Try searching for...
SCFBio, IIT Delhi
Formula: C15H12O6 | Mol. Weight: 288.25 g/mol
IUPAC: (1R,9R,17S)-8,16-dioxatetracyclo[7.7.1.02,7.010,15]heptadeca-2,4,6,10(15),11,13-hexaene-3,5,13,17-tetrol
C1=CC2=C(C=C1O)OC3C(C2OC4=CC(=CC(=C34)O)O)O