OC1C(O)C(OC2=C(O)C3=C(OC(=CC3=O)C3=CC(=C(O)C=C3)C3=C4OC(=CC(=O)C4=C(O)C=C3O)C3=CC=CC=C3)C=C2O)OC(C1O)C(O)=O