| abstract |
New compounds of formula (I) are described wherein R.sup.1 is different from each other, each being hydrogen, C1-C4alkyl or -C ( 0) -R.sup.5, wherein one of R.sup.1 in R.sup.2 is always -C (O) -R.sup.5, wherein R5 is an alkyl group having from 1 to 4 carbon atoms or an alkoxy group having from 1 to 4 carbon atoms, R5 is the same or different and selected from methyl groups, ethyl groups, or formulas A and B or CH 2 OCH 3 O 2 or O 2 R 3 in R 4 together with the adjacent oxygen atom attached to the pyridine ring and the carbon atom in the pyridine ring, form a ring wherein the substituent R 3 for R 4 is a group of formula -CH 2. CH 2 OCH 2 OCH 2 OCH 2 OCH 2 OCH 2 OCH 2 OCH 2 and their physiologically you accept other salts, pharmaceutical compositions |