Using O=C1CCC(=O)N1Cl, CSc1ncc2cc(C=O)n(C3CCCC3)c2n1 to produce CSc1ncc2c(Cl)c(C=O)n(C3CCCC3)c2n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.