Using O=P(Br)(Br)Br, Oc1c(-c2ccccc2)nnc2c(Cl)cccc12 to produce Clc1cccc2c(Br)c(-c3ccccc3)nnc12, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.