CN1C2=C(C=CC=C2O)C(=O)C2=C1C1=C(OC(C)(CO)C=C1)C(C1CC(C)(C)OC3=C1C1=C(C(OC4OC(C(O)C(O)C4O)C(O)=O)=C3)C(=O)C3=C(N1C)C(O)=CC=C3)=C2O