A HUMAN NECESSITIES
A61 MEDICAL OR VETERINARY SCIENCE; HYGIENE
A61K PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
31/00 Medicinal preparations containing organic active ingredients
A61K31/66 Phosphorus compounds
A61K31/662 Phosphorus acids or esters thereof having P—C bonds, e.g. foscarnet, trichlorfon
A61K31/663 Compounds having two or more phosphorus acid groups or esters thereof, e.g. clodronic acid, pamidronic acid