Using CCCSC1CCN(c2ccc(N3CCN(c4ccc(C(=O)OCC)cc4)CC3)cc2)CC1 to produce CCCSC1CCN(c2ccc(N3CCN(c4ccc(C(=O)O)cc4)CC3)cc2)CC1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.