Using COc1ccc([C@H](C)N2CC(C(C)=O)CC2=O)cc1 to produce COc1ccc([C@H](C)N2C[C@H](C(C)=O)CC2=O)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.