Using COC(=O)c1nc2cc(C(=O)NC3CC3)c(Cl)cc2[nH]1 to produce O=C(O)c1nc2cc(C(=O)NC3CC3)c(Cl)cc2[nH]1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.