Using CCOC(=O)C(=O)c1csc(N(C)C(=O)OC(C)(C)CC)n1 to produce CCC(C)(C)OC(=O)N(C)c1nc(C(=O)C(=O)O)cs1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.