A compound of formula (I) ##STR1## in which R is (a) a hydrogen atom; (b) a linear or branched (C.sub.1 -C.sub.6) alkyl group; an allyl group; a cycloalkylmethyl group in which the cycloalkyl moiety has from 3 to 6 carbon atoms; a phenylmethyl group unsubstituted or substituted with one to three substituents chosen from halogen atoms and trifluoromethyl, nitro, amino, dimethylamino, cyano, aminocarbonyl, linear or branched (C.sub.1 -C.sub.3) alkyl, linear or branched (C.sub.1 -C.sub.3) alkoxy and linear or branched (C.sub.1 -C.sub.3) alkylthio groups; a 2-phenylethyl group; a 3-phenylpropyl group; a 3-phenyl-2-propenyl group; a phenylcarbonylmethyl group; a naphthylmethyl group; a pyridylmethyl group; a furylmethyl group; or a thienylmethyl group; or (c) a linear or branched (C.sub.2 -C.sub.6) alkanoyl group; a cycloalkylcarbonyl group in which the cycloalkyl moiety has from 3 to 6 carbon atoms; a trifluoroacetyl group; a phenyl-carbonyl group unsubstituted or substituted with one to three substituents chosen from halogen atoms and trifluoromethyl, nitro, linear or branched (C.sub.1 -C.sub.3) alkyl, linear or branched (C.sub.1 -C.sub.3) alkoxy and linear or branched (C.sub.1 -C.sub.3) alkylthio groups; a 1-oxo-3-phenyl-2-propenyl group; a naphthylcarbonyl group; a pyridylcarbonyl group; a furylcarbonyl group; a thienylcarbonyl group; a (2-indolyl)-carbonyl group; or a (5-indolyl)carbonyl group; or a pharmacologically acceptable acid addition salt thereof.
化学式(I)的化合物##STR1##中,其中R是(a)氢原子;(b)线性或支链(C.sub.1-C.sub.6)烷基基团;烯丙基基团;环烷基甲基基团,其中环烷基部分具有3至6个碳原子;未取代或取代有来自卤素原子和三
氟甲基、硝基、
氨基、
二甲胺基、
氰基、
氨基羰基、线性或支链(C.sub.1-C.sub.3)烷基、线性或支链(C.sub.1-C.sub.3)烷氧基和线性或支链(C.sub.1-C.sub.3)
硫代烷基基团的苯甲基基团;2-苯乙基基团;3-苯基丙基基团;3-苯基-2-
丙烯基基团;苯甲酰基基团;
萘甲基基团;
吡啶甲基基团;
呋喃甲基基团;或
噻吩甲基基团;或(c)线性或支链(C.sub.2-C.sub.6)烷酰基基团;环烷基羰基基团,其中环烷基部分具有3至6个碳原子;三
氟乙酰基基团;未取代或取代有来自卤素原子和三
氟甲基、硝基、线性或支链(C.sub.1-C.sub.3)烷基、线性或支链(C.sub.1-C.sub.3)烷氧基和线性或支链(C.sub.1-C.sub.3)
硫代烷基基团的苯羰基基团;1-氧代-3-苯基-2-
丙烯基基团;
萘羰基基团;
吡啶羰基基团;
呋喃羰基基团;
噻吩羰基基团;(2-
吲哚基)-羰基基团;或(5-
吲哚基)羰基基团;或其药理学上可接受的酸盐。