A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
A61K31/00—Medicinal preparations containing organic active ingredients
A61K31/33—Heterocyclic compounds
A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
A61K31/495—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having six-membered rings with two or more nitrogen atoms as the only ring heteroatoms, e.g. piperazine or tetrazines
A61K31/505—Pyrimidines; Hydrogenated pyrimidines, e.g. trimethoprim
A61K31/519—Pyrimidines; Hydrogenated pyrimidines, e.g. trimethoprim ortho- or peri-condensed with heterocyclic rings
A61K31/52—Purines, e.g. adenine
A—HUMAN NECESSITIES
A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
A61K31/00—Medicinal preparations containing organic active ingredients