CAS 55881-52-2 appears in our catalog under these names: Diethylphosphonopentanoic acid, 95%, 5-(Diethoxyphosphoryl)pentanoic acid, 97%, 5-(Diethoxyphosphoryl)pentanoic acid 97%, 5-(Diethoxyphosphoryl)pentanoic acid, 97%, 97%. Offered by: Combi-blocks, AmBeed, Chemat. Available pack sizes: 250mg, 5g, 10g, 1g, 25g.