GEM-DIPHOSPHONIC ACID-NITROSOCARBAMOYL DERIVATIVES, METHOD FOR THE PRODUCTION THEREOF AND PHARMACEUTICAL PREPARATIONS CONTAINING THE SAME

摘要

PCT No. PCT/EP92/00745 Sec. 371 Date Oct. 8, 1993 Sec. 102(e) Date Oct. 8, 1993 PCT Filed Apr. 3, 1992 PCT Pub. No. WO92/18511 PCT Pub. Date Oct. 29, 1992.Diphosphonic acids of formula (I) are disclosed. These compounds are useful as antitumor agents.