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