Using CC(C)(C)OC(=O)NC1C(=O)N(CC(=O)C2CC2)c2ccccc2N(CC(=O)C2CC2)C1=O to produce NC1C(=O)N(CC(=O)C2CC2)c2ccccc2N(CC(=O)C2CC2)C1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.