COC1=C(C2CC(C)(C)OC3=C2C(O)=C2C=C(C(=O)OC2=C3C(C)(C)C=C)C(C)(C)C=C)C2=C(C(O)=C1)C(=O)C1=C(N2)C(OC)=C(O)C=C1