CAS 856661-92-2 appears in our catalog under these names: Biotin–X–NTA, NE-(N-(+)-BIOTINYL-6-AMINOHEXANOYL)-NA,&, Biotin-X-NTA, Biotin-X-NTA, 98.11%. Offered by: GLPBio, Sigma-Aldrich, Chemat, MedChemExpress. Available pack sizes: 1mg, 5mg, 10 mg, 5 mg.