1,1,2,3,3-Pentamethyl-1,3-propylenephosphinic acid 1-Hydroxy-2,2,3,4,4-pentamethylphosphetane 1-oxide 35210-25-4 NSC84361 Phosphetane, 1-hydroxy-2,2,3,4,4-pentamethyl-, 1-oxide