Using CCCOc1ccc(C=O)cc1, O=C(O)CCCCC[P+](c1ccccc1)(c1ccccc1)c1ccccc1 to produce CCCOc1ccc(C=CCCCCC(=O)O)cc1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.