Using COC(=O)CCC(C)=O, Nc1sc2c(c1C(=O)c1cccc(Cl)c1)CCCC2 to produce COC(=O)Cc1c(C)nc2sc3c(c2c1-c1cccc(Cl)c1)CCCC3, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.