Using CCc1nc2c(-c3ccc(C)cc3C)cc(C)nn2c1NC(=O)OC(C)(C)C to produce CCc1nc2c(-c3ccc(C)cc3C)cc(C)nn2c1N, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.