Using CCO, CCCCOC(=O)N1CCN(C(=O)CNC(=O)c2nc(-c3ccccc3)sc2NCCC(=O)O)CC1 to produce CCCCOC(=O)N1CCN(C(=O)CNC(=O)c2nc(-c3ccccc3)sc2NCCC(=O)OCC)CC1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.