Product name: Bovine Serum Albumin Other name: BSA or "Fraction V" CAS No: 9048-46-8 Molecular Formular: C8H9O Application: Pharmaceutical Intermediates What is bovine serum albumin? Bovine serum albumin (bsa bovine serum albumin or "Fraction V") is a serum albumin protein derived from cows. It is often used as a protein concentration standard in lab experiments. http://www.cnraws.com