Using Cc1ccc(S(=O)(=O)N[C@@H](CN)C(=O)O)cc1, C=C(C)C to produce Cc1ccc(S(=O)(=O)N[C@@](CN)(C(=O)O)C(C)(C)C)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.