Using NCCS, CC(C)(C)OC(=O)N[C@H](C(=O)F)C(C)(C)C to produce CC(C)(C)OC(=O)N[C@H](C(=O)NCCS)C(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.