Using OCCBr, Clc1ccc2c(c1)C(Br)c1cc(Cl)ccc1OCO2 to produce Clc1ccc2c(c1)C(OCCBr)c1cc(Cl)ccc1OCO2, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.