| abstract |
PCT No. PCT/EP97/05843 Sec. 371 Date Apr. 23, 1999 Sec. 102(e) Date Apr. 23, 1999 PCT Filed Oct. 22, 1997 PCT Pub. No. WO98/17672 PCT Pub. Date Apr. 30, 1998Compounds of the formula I in which R1 is hydroxyl or an aliphatic, araliphatic or aromatic radical, X is a divalent aliphatic, cycloaliphatic, cycloaliphatic-aliphatic, araliphatic, heteroarylaliphatic or aromatic radical, R2 is hydrogen or an aliphatic or araliphatic radical, alk is lower alkylidene and R3, R4 and R5 independently of one another are hydrogen, lower alkyl, halogen, trifluoromethyl, cyano or nitro, and their salts can be used for the treatment of pathological conditions which respond to blockage of excitatory amino acid receptors, and for the production of pharmaceutical preparations. |