CAS 116919-18-7 appears in our catalog under these names: Biotin–maleimide, Biotin-NH-NH-Mal, Biotin-maleimide, Biotin-maleimide 95%, 6-(2,5-Dioxo-2,5-dihydro-1H-pyrrol-1-yl)-N'-(5-((3aS,4S,6aR)-2-oxohexahydro-1H-thieno[3,4-d]imidazol-4-yl)pentanoyl)hexanehydrazide, 95%, 95%. Offered by: GLPBio, Iris Biotech, Biosynth, Ambeed, Sigma-Aldrich. Available pack sizes: 10mg, 100mg, 250mg, 25mg, 50mg, 1g, 25 mg, 100 mg.