Using CCCCOC(=O)Cl, COc1c(O)cc2c(c1OC)-c1ccc(SC)c(=O)cc1[C@@H](NC(C)=O)CC2 to produce CCCCOC(=O)Oc1cc2c(c(OC)c1OC)-c1ccc(SC)c(=O)cc1C(NC(C)=O)CC2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.