95856 ā
Compounds containing elements of Groups 5 or 15 of the Periodic System; Phosphorus compounds without PāC bonds; Esters of oxyacids of phosphorus; Esters of phosphorous acids; Compounds containing the structure P-O-acyl, P-O-heteroatom, P-O-CN Compounds containing the structure P-O-C(=X)- (X = O, S, Se)