Compounds which can be represented by general formula (I) indicated below and in which: ##STR1## R.sub.1 and R.sub.2 are selected, independently, from hydrogen, an alkyl group having from 1 to 4 carbon atoms, a halogen group such as a fluoro, chloro or bromo group, the methoxy group, the cyano group, or the trifluoromethyl group, and R.sub.3 is selected, independently, from a phenyl or a 2 (or 3 or 4)-pyridyl group, unsubstituted or mono- or di-substituted with an alkyl or alkoxy group having from 1 to 4 carbon atoms, with a halogen group such as a fluoro or chloro group, with the trifluoromethyl group, with the cyano group, with the nitro group, with the amino group, or with the phenyl group, a 1 (or 2)-naphthyl group, a 2 (or 3)-indolyl group as such or N-alkylated with an alkyl group having from 1 to 3 carbon atoms, a 2 (or 3, 4, 5, 6, 7 or 8)-quinolinyl or a 1 (or 3, 4, 5, 6, 7 or 8)-isoquinolinyl group, unsubstituted or mono- or di-substituted with a group selected, independently, from the methyl, ethyl, propyl, isopropyl, methoxy, fluoro, chloro, trifluoromethyl, cyano, amino, or nitro groups, a 2 (or 5 or 6)-quinoxalyl group, a (or 4, 5, 6, 7 or 8) cinnolyl group, or a 2 (or 4, 5, 6 or 7)-benzimidazolyl group, and in which the configuration of the chiral centre marked with an asterisk (*) in the general formula (I) may be, independently, L, D or DL (racemic).

Samenstellingen die door algemene hieronder vermelde formule (I) kunnen worden vertegenwoordigd en waarin: ## STR1 ## R.sub.1 en R.sub.2 worden geselecteerd, onafhankelijk, uit waterstof, een alkyl groep van 1 tot 4 koolstofatomen hebben, een halogeengroep zoals een fluoro, chloor of bromogroep, de methoxy groep, de cyano groep, of de trifluoromethylgroep die, en R.sub.3 wordt geselecteerd, onafhankelijk, uit een fenyl of 2 (of 3 of groep 4)-pyridyl, unsubstituted of mono - of di-substituted met een alkyl of alkoxy groep die van 1 tot 4 koolstofatomen hebben, met een halogeengroep zoals een fluoro of chloorgroep, met de trifluoromethylgroep, met de cyano groep, met de nitrogroep, met de aminogroep, of fluoromethyl group, and R.sub.3 is selected, independently, from a phenyl or a 2 (or 3 or 4)-pyridyl group, unsubstituted or mono - or di-substituted with an alkyl or alkoxy group having from 1 to 4 carbon atoms, with a halogen group such as a fluoro or chloro group, with the trifluoromethyl group, with the cyano group, with the nitro group, with the amino group, or with the phenyl group, a 1 (or 2)-naphthyl group, a 2 (or 3)-indolyl group as such of n-Alkylated met een alkyl groep die van 1 tot 3 koolstofatomen heeft, 2 (of 3..4..5..6..7 of 8)-quinolinyl of een 1 (of 3 groep..4..5..6..7 of 8)-isoquinolinyl, unsubstituted of mono - of di-substituted met een die, onafhankelijk wordt geselecteerd, uit het methoxy methyl, ethyl, propyl, isopropyl groep, fluoro, chloor, trifluoromethyl, cyano, amino, of nitrogroepen, 2 (of 5 of groep 6)-quinoxalyl, a (of 4..5..6..7 of 8) cinnolylgroep, of 2 (of 4 groep..5..6 of 7)-benzimidazolyl, en waarin de configuratie van het chiral centrum merkte selected, independently, from the methyl, ethyl, propyl, isopropyl, methoxy, fluoro, chloro, trifluoromethyl, cyano, amino, or nitro groups, a 2 (or 5 or 6)-quinoxalyl group, a (or 4,,5,,6,,7 or 8) cinnolyl group, or a 2 (or 4,,5,,6 or 7)-benzimidazolyl group, and in which the configuration of the chiral centre marked with an asterisk (*) in the general formula (I) may be, independently, L, D or DL (racemic).

 
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