Using CC(C)(C)OC(=O)N[C@@H](CS(=O)(=O)Cc1cnccn1)C(=O)O, CO to produce COC(=O)[C@H](CS(=O)(=O)Cc1cnccn1)NC(=O)OC(C)(C)C, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.