Using COc1ccc(N2CCOCC2)c2sc(-c3nc4c([nH]3)CCNCC4)nc12, CC(=O)Cl to produce COc1ccc(N2CCOCC2)c2sc(-c3nc4c([nH]3)CCN(C(C)=O)CC4)nc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.