Using COC(=O)N[C@H](C(=O)O)C(C)C, O=C1CCC(=O)N1O to produce COC(=O)N[C@H](C(=O)ON1C(=O)CCC1=O)C(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.