CAS 78-83-1 appears in our catalog under these names: Isobutanol, Spectrophotometric Grade, 99+% , Isobutanol, ACS, 99+% , Isobutanol, HPLC Grade, 99+% , Isobutanol, 99% . Offered by: Thermo Scientific (Alfa Aesar). Available pack sizes: 1L, 4L, *4x1L, 500ml, 2500ml.