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