4-METHYLSULFONYL-2-NITROCHLOROBENZENE
4-NITRO-2-AMINOPHENOL-6-SULFONIC ACID
4-NITRO-4'-AMINO-DIPHENYLAMINE-2-SULFONIC ACID
4-NITRO-4'-AMINOSTILBENE-2,2'-DISULFONIC ACID
(4-NDPA)
5-CHLORO-1-PENTYNE