CAS 643-65-2 appears in our catalog under these names: Ketoprofen Impurity 4, 3-Methylbenzophenone, >95% (HPLC), 3-Methylbenzophenone, 3–Methylbenzophenone, 3-Methylbenzophenone, 98+% . Offered by: Chemat Brand, TRC, Mikromol, Dr. Ehrenstorfer, GLPBio. Available pack sizes: on request, 100mg, 500mg, 50mg, 25g, 5g, 10g, 50g.