Using CCCNC(=O)[C@@H]1CCC[C@@H]2SCC[C@H](NC(=O)OC(C)(C)C)C(=O)N21 to produce CCCNC(=O)[C@@H]1CCC[C@@H]2SCC[C@H](N)C(=O)N21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.