Using CCCCCCC(CC(=O)c1ccccc1)P(=O)(CC(=O)OC)OCC to produce CCCCCCC(CC(=O)c1ccccc1)P(=O)(CC(=O)O)OCC, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.