Using COC(=N)N, CC(=O)C(=Cc1cccc2nonc12)C(=O)OC(C)C to produce COC1=NC(c2cccc3nonc23)C(C(=O)OC(C)C)=C(C)N1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.