Using CC1CN(C(=O)c2cc3cc(Cl)ccc3[nH]2)CCN1, C=O to produce CC1CN(C(=O)c2cc3cc(Cl)ccc3[nH]2)CCN1C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.