The molecule is a peptide sulfate salt obtained by combining leupeptin with 0.5 molar equivalents of sulfuric acid. It has a role as a calpain inhibitor, a cathepsin B inhibitor, an EC 3.4.21.4 (trypsin) inhibitor and a serine protease inhibitor.
(2S)-2-acetamido-N-[(2S)-1-[[(2S)-5-(diaminomethylideneamino)-1-oxopentan-2-yl]amino]-4-methyl-1-oxopentan-2-yl]-4-methylpentanamide;sulfuric acid