Using O=C(CBr)CBr, O=C(O)c1c(Cl)cccc1Cl to produce O=C(COC(=O)c1c(Cl)cccc1Cl)COC(=O)c1c(Cl)cccc1Cl, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.