SULFUR-CONTAINING PHOSPHONIC ACIDS OR THEIR PHARMACEUTICALLY ACCEPTABLE SALTS OR ESTERS AND PHARMACEUTICAL COMPOSITION BASED ON SAID Russian patent published in 1999 - IPC

FIELD: organic chemistry, pharmacy. SUBSTANCE: invention relates to sulfur-containing phosphonic acids of the formula (I) where R is a group -PO₃H₂ or P(O)(OH)R⁴ where R⁴ - alkyl; R¹ - hydrogen atom, C_1-8-alkyl possibly substituted with phenyl, phenyl or two adjacent carbon atoms that in common with R¹ form cyclopentane or cyclohexane; R² is C_1-8-alkyl or phenyl; R² - H or OH; n = 1-6, or their pharmaceutically acceptable salts or esters that can be used for prophylaxis and treatment of patients with disorders of calcium and phosporus metabolism. EFFECT: valuable pharmacological properties of compounds. 6 cl, 2 tbl, 26 ex