Using CC(C)(C)OC(=O)C(C=O)N1C(=O)c2ccccc2C1=O, CN1CCC(S)(C(N)C(=O)O)CC1 to produce CN1CCC2(CC1)SC(C(C(=O)OC(C)(C)C)N1C(=O)c3ccccc3C1=O)NC2C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.