CAS 1144107-82-3 (potassium salt), 1121756-16-8 (inner salt), 2098639-31-5 (sodium salt) appears in our catalog under these names: Sulfo-Cyanine5 carboxylic acid, 95%, Sulfo–Cyanine5 carboxylic acid. Offered by: Lumiprobe, GLPBio. Available pack sizes: 1mg, 5mg, 25mg, 50mg, 100mg.