Using C=CCC(CCC(C)=O)(C(=O)OCC)C(=O)OCC, [PH3+]C(c1ccccc1)(c1ccccc1)c1ccccc1 to produce C=CCC(CCC(=C)C)(C(=O)OCC)C(=O)OCC, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.