OC1C(OC2=C3C(=O)C4=C(C=CC=C4O)C(C4C5=C(C(O)=CC=C5)C(=O)C5=C4C=C(C=O)C=C5O)C3=CC(C(O)=O)=C2O)OC(C(O)C1O)C(O)=O