Using O=C[O-], COc1ccc(Cn2c(=O)c3cc(CNC(C)=O)ccc3n(C3CCNCC3)c2=O)cc1OC to produce COc1ccc(Cn2c(=O)c3cc(CNC(C)=O)ccc3n(C3CCN(C=O)CC3)c2=O)cc1OC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.