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