OC1C(OC2=CC(C=O)=CC3=C2C(=O)C2=C(C=CC=C2O)C3C2C3=CC(C(O)=O)=C(O)C(O)=C3C(=O)C3=C2C=CC=C3O)OC(C(O)C1O)C(O)=O