tris(tetra-n-butylammonium) hydrogen methylenediphosphonate; (Bu4N)3 OMDP; (NBu4)3HMDP; tris(tetrabutylammonium) salt of methylenebis(phosphonic acid); tris(tetrabutylammonium) salt of methylenebis(phosphonic) acid; tris(tetra-n-butylammonium)hydrogen methylenediphosphonate; tris(tetra-n-butylammonium)hydrogen methylenepyrophosphate