Using CC(C)(C)OC(=O)c1c(N)sc2c1C[C@@H](C(=O)O)N(C(=O)OC(C)(C)C)C2, N[C@@H](CCS)C(=O)O to produce CC(C)(C)OC(=O)c1c(N)sc2c1C[C@@H](C(=O)NC1CCSC1=O)N(C(=O)OC(C)(C)C)C2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.