Bronopol is a highly active antimicrobial chemical compound whose chemical formula is 2-bromo-2-nitropropane-1,3-diol. Bronopol was invented by The Boots Company PLC, Nottingham, England in the early 1960s and first applications were as a preservative for pharmaceuticals. Bronopol's low mammalian toxicity (at in-use levels) and exceptional activity against bacteria (especially the troublesome Gram-negative species) ensured that it became popular as a preservative in many consumer products such as shampoos and cosmetics.