for the following products
1-Propylphosphonic acid cyclic anhydride | Propanephosphonic anhydride 50 % in ethyl acetate | Propylphosphonic anhydride | Propylphosphonic anhydride solution and 2,4,6-Tripropyl-1,3,5,2,4,6-trioxatriphosphorinane-2,4,6-trioxide
