Using O=C([O-])O, CCOC(=O)c1c(C)csc1NC(=O)c1cccc(CN(CC)CC)c1 to produce CCOC(=O)c1c(NC(=O)c2cccc(CN(CC)CC)c2)sc(C=O)c1C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.