5-20-03-00535 (Beilstein Handbook Reference) 74038-33-8 BRN 1566445 Dipiperidinophosphinous acid butyl ester N-Butyl dipiperidinophosphinite NSC 202977 Phosphinous acid, di-1-piperidinyl-, butyl ester (9CI) Phosphinous acid, dipiperidino-, butyl ester