Using O=C(c1ccccc1)c1c[nH]nc1-c1cccc(Cl)c1, COCCl to produce COCn1cc(C(=O)c2ccccc2)c(-c2cccc(Cl)c2)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.