(3-(Dimethylamino)-1-hydroxypropylidene)diphosphonic acid 63132-39-8 AHGA diphosphonate Me2-APD Olpadronate Olpadronic acid Olpadronic acid [INN] Phosphonic acid, (3-(dimethylamino)-1-hydroxypropylidene)bis- dimethyl-pamidronate hydroxydimethyl aminopropylidene biphosphonate