Abstract: Compounds of the general formula: ##STR1## and acid addition salts thereof; in which Ar and Ar.sup.1 which may be the same or different, each represent an aromatic radical which may be substituted one or more times by substituents selected from the following:halogen;lower alkyl;lower alkoxy;alkylenedioxy;aralkoxy;aryloxy;trihalomethyl;carboxy;carboxyalkyl;cyano;carboxamido;di-lower alkylamino;nitro; andlower alkyl sulphonylprovided that one of the groups Ar and Ar.sup.1 carries at least one alkoxy, alkylenedioxy, carboxy or carboxyalkyl substituent; andAlk.sup.1 and Alk.sup.2, which may be the same or different, each represent an alkylene group containing from 1 to 8 carbon atoms which may be substituted one or more times by lower alkyl;X and Y which may be the same or different represent oxygen, nitrogen or sulphur; and in which the imidazole ring may be substituted by one or more lower alkyl substituentshave antithrombotic activity.

Abstract: Compounds of the general formula: ##STR1## and acid addition salts thereof; in whichAr and Ar.sup.1 which may be the same or different, each represent an aromatic radical which may be substituted one or more times by substituents selected from the following:halogen;lower alkyl;lower alkoxy;alkylenedioxy;aralkoxy;aryloxy;trihalomethyl;carboxy;carboxyalkyl;cyano;carboxamido;di-lower alkylamino;nitro; andlower alkyl sulphonylprovided that one of the groups Ar and Ar.sup.1 carries at least one alkoxy, alkylenedioxy, carboxy or carboxyalkyl substituent; andAlk.sup.1 and Alk.sup.2, which may be the same or different, each represent an alkylene group containing from 1 to 8 carbon atoms which may be substituted one or more times by lower alkyl;X and Y which may be the same or different represent oxygen, nitrogen or sulphur; and in which the imidazole ring may be substituted by one or more lower alkyl substituentshave antithrombotic activitiy.

Abstract: Compounds of the general formulae: ##STR1## in which Ar and Ar.sup.1 which may be the same or different represent aromatic radicals optionally substituted once or more than by substituents selected from halogen, lower alkyl and lower alkoxy and Alk represents an alkylene group containing from 1 to 4 carbon atoms which alkylene group may be interrupted with a heteroatom; and acid addition salts thereof.These compounds have anti-anaerobe and also anti-fungal activity and are non-mutagenic.

Abstract: Compounds corresponding to the following general formula: ##STR1## wherein Ar and Ar.sup.1, which may be the same or different, each represents an aromatic radical which may be substituted one or more times by halogen and/or nitro and/or lower alkyl and/or trihalomethyl and/or cyano and/or lower alkoxy and/or di-lower alkyl-amino, the alkyl groups optionally completing a ring optionally incorporating a further heteroatom, and/or lower alkyl sulphonyl;Alk.sup.1 and Alk.sup.2, which may be the same or different, each represents an alkylene group containing from one to eight carbon atoms which may be substituted one or more times by aryl and/or cycloalkyl and/or lower alkyl and if two such alkyl groups are present, they may complete a ring optionally containing a heteroatom and in which imidazole ring may be further substituted; and m represents 0 or 1; provided that not both Ar and Ar.sup.1 represent phenyl; and acid addition salts thereof.