Using Cn1c(=O)n(CCCCC(N=C(c2ccccc2)c2ccccc2)C(=O)OC(C)(C)C)c(=O)c2ccccc21 to produce Cn1c(=O)n(CCCCC(N)C(=O)OC(C)(C)C)c(=O)c2ccccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.