| abstract |
Use of a vitamin D3 derivative of formula (I): <CHEM> wherein R1, R2 and R3, which may be the same or different and represent a hydrogen atom or a hydroxyl group; and R4 is hydrogen or a C4-6 alkyl group that is optionally substituted by a hydroxy group is disclosed for the preparation of a pharmaceutical composition useful for treatment of hyperparathyroidism, particularly secondary hyperparathyroidism. |