Using COC(=O)c1ccc(C=C2CN(Cc3ccc4cc[nH]c4c3)C2)c(Cl)c1 to produce O=C(O)c1ccc(C=C2CN(Cc3ccc4cc[nH]c4c3)C2)c(Cl)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.