69408-66-8 GLYCINE, N-(N-(3-AMINO-3,3-DIPHOSPHONOPROPYL)GLYCYL)-, DIHYDRATE N-(N-(3-Amino-3,3-diphosphonopropyl)glycyl)glycine dihydrate N-(alpha-Aminopropylidene-alpha,alpha-diphosphono)glycylglycine dihydrate