Using O=Cc1cccc(Br)c1, O=C(O)CCC[P+](c1ccccc1)(c1ccccc1)c1ccccc1 to produce O=C(O)CC/C=C/c1cccc(Br)c1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.