OC1C(OC2=CC=CC3=C2C(=O)C2=C(C=C(C=C2O)C(O)=O)C3C2C3=C(C(O)=C(O)C=C3)C(=O)C3=C2C=C(C=O)C=C3O)OC(C(O)C1O)C(O)=O