Using CN(Cc1cc(-c2ccccc2)c(C(=O)c2ccccc2)s1)C(=O)OC(C)(C)C to produce CNCc1cc(-c2ccccc2)c(C(=O)c2ccccc2)s1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.