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(Science: chemical) 1-chloro-2,4-dinitrobenzene. A skin irritant that may cause dermatitis of both primary and allergic types. Contact sensitization with dncb has been used as a measure of cellular immunity. Dncb is also used as a reagent for the detection and determination of pyridine compounds.

Pharmacological action: indicators and reagents, irritants.

chemical name: benzene, 1-chloro-2,4-dinitro-