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