abstract |
PCT No. PCT/DE94/00495 Sec. 371 Date Jan. 22, 1996 Sec. 102(e) Date Jan. 22, 1996 PCT Filed Apr. 28, 1994 PCT Pub. No. WO94/25470 PCT Pub. Date Nov. 10, 1994Compounds of formula I <IMAGE> (I) are described, in which substituents R1-R4 have the meanings mentioned in the application as well as their production and use in pharmaceutical agents. |