4 7-dibromo-2 1 3-benzothiadiazole July 8, 2019 16 32 64 128 1 4 dibromobutane 4 7-dibromo-2 1 3-benzoselenadiazole 4 7-dibromo-5 6-dinitro-2 1 3-benzothiadiazole 7-bromobenzo c 1 2 5 thiadiazole-4-carbaldehyde
