Using CCCCCC(O)CC[C@H]1CC2OCCOC2[C@@H]1CCCCCCC(=O)OCC to produce CCCCCC(=O)CC[C@H]1CC2OCCOC2[C@@H]1CCCCCCC(=O)OCC, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.