CAS 68957-94-8 appears in our catalog under these names: 1-Propylphosphonic acid cyclic anhydride, 50+% w/w soln. in , 1-Propylphosphonic acid cyclic anhydride, 50+% soln. in ethy, 1-Propylphosphonic acid cyclic anhydride, 50+% soln. in DMF . Offered by: Thermo Scientific (Alfa Aesar). Available pack sizes: 50g, 250g, 10g.