Using O=P(c1ccc(Cl)cc1)(c1ccc(Cl)cc1)c1ccc(Cl)cc1 to produce Clc1ccc(P(c2ccc(Cl)cc2)c2ccc(Cl)cc2)cc1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.