COC1=C(O)C=CC2=C1N(C)C1=C(C(O)=CC3=C1C(C(O3)C(C)(C)O)C1=C(O)C3=C(N(C)C4=C(C=CC(O)=C4OC)C3=O)C3=C1OC(C)(C)C=C3)C2=O