Using BrBr, CCOC(=O)c1cc2c(Br)coc2nc1C(=O)OCC to produce CCOC(=O)c1cc2c(Br)c(Br)oc2nc1C(=O)OCC, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.