Abstract: Heterocyclic compounds of the formula: ##STR1## wherein the pyrroline ring and the symbols X.sub.1 and X.sub.2 together form an unsubstituted or substituted isoindoline nucleus, or a 6,7-dihydro-5H-pyrrolo[3,4-b]pyrazine, 6,7-dihydro-5H-pyrrolo[3,4-b]pyridine or 2,3,6,7-tetrahydro-5H-1,4-oxathiino[2,3-c]pyrrole nucleus, the 1,8-naphthyridin-2-yl nucleus is unsubstituted or substituted, and the grouping --NR.sub.1 R.sub.2 is an amino or substituted amino group, are new compounds which are active as tranquillizers, hypnotics, anti-convulsant agents and anti-spasmodics.

Abstract: 1,2-Dithiole derivatives of the formula: ##STR1## wherein X.sub.1, X.sub.2 and X.sub.3 represent hydrogen, alkyl of 1 through 4 carbon atoms or alkoxy of 1 through 4 carbon atoms, at least one of X.sub.1, X.sub.2 and X.sub.3 representing hydrogen, and Y represents sulphur or oxygen or the hydroxyimino radical, are new compounds useful in the treatment of bilharziasis and amoebiasis.

Abstract: Isoindolin-1-one derivatives substituted on the nitrogen atom in the 2-position by an unsubstituted or substituted phenyl radical or a heterocyclic radical having aromatic characteristics, substituted in the 3-position by a 3-amino(or substituted amino)-2-hydroxy-propoxy group, and optionally substituted in the 5- and/or 6-positions by one or two alkoxy radicals or optionally substituted in the 5- and 6-positions by a methylenedioxy radical, possess pharmacodynamic properties, and are especially useful as antiarrhythmic agents.

Abstract: Compounds of the formula: ##STR1## wherein one of the symbols =X- represents =N- and the other three each represent a group ##STR2## in which Y represents hydrogen, halogen, alkyl, alkoxy, cyano or nitro, =A- and =A.sub.1 - represent a group =CH- or =N-, =A.sub.1 - representing a group =CH- or =N- when =A- represents =CH- and =A.sub.1 - representing =N- when A represents =N-, Z represents hydrogen, halogen, alkyl, alkoxy or nitro, m represents zero or an integer from 1 to 4, and (i) n represents zero and R represents hydrogen, alkyl, alkenyl, alkynyl, hydroxyalkyl or phenyl, or (ii) n represents 1 and R represents alkyl, hydroxyalkyl or phenyl, are new compounds possessing pharmacological properties; they are particularly active as tranquilizers and anticonvulsant agents.

Abstract: 1,4-Oxathiino[2,3-c]pyrrole derivatives of the formula: ##STR1## wherein A represents a phenyl, 2-pyridyl, 3-pyridazinyl, 2-quinolyl or naphthyridinyl radical, or a said radical substituted by one or two atoms or radicals selected from halogen, alkyl of 1 through 4 carbon atoms, alkoxy of 1 through 4 carbon atoms and nitro, and R represents alkyl of 1 through 4 carbon atoms, cycloalkyl of 3 through 6 carbon atoms, alkenyl of 2 through 4 carbon atoms or alkynyl of 2 through 4 carbon atoms, possess pharmacological properties, and are especially useful as tranquillizers, anti-convulsant agents, decontracturants, and agents to produce hypnosis.

Abstract: Compounds of the formula: ##STR1## wherein one of the symbols =X-- represents =N-- and the other three each represent a group ##STR2## in which Y represents hydrogen, halogen, alkyl, alkoxy, cyano or nitro, at least two of the symbols representing hydrogen, Z represents hydrogen, halogen, alkyl, alkoxy, trifluoromethyl or nitro, and (i) n represents zero and R represents hydrogen, alkyl, alkenyl, alkynyl, hydroxyalkyl or phenyl, or (ii) n represents 1 and R represents alkyl, hydroxyalkyl or phenyl, are new compounds possessing pharmacological properties; they are particularly active as tranquilizers and anti-convulsant agents.

Abstract: Isoindolin-1-one derivatives carrying on the nitrogen atom in the 2-position a phenyl or pyridyl radical, optionally carrying one or two substituents selected from halogen, alkyl (C.sub.1 -C.sub.4), alkoxy (C.sub.1 -C.sub.4), cyano and trifluoromethyl, and in the 3-position a grouping --O--T--NR.sub.1 R.sub.2 wherein T is alkylene (C.sub.2 -C.sub.6), and R.sub.1 and R.sub.2 represent hydrogen or alkyl (C.sub.1 -C.sub.4), are new compounds possessing pharmacodynamic properties and are useful as anti-arrhythmic agents.

Abstract: Isoindolin-1-one derivatives carrying on the nitrogen atom in the 2-position a phenyl or pyridyl radical, optionally carrying one or two substituents selected from halogen, alkyl (C.sub.1 -C.sub.4), alkoxy (C.sub.1 -C.sub.4), cyano and trifluoromethyl, and in the 3-position a grouping --O--T--NR.sub.1 R.sub.2 wherein T is alkylene (C.sub.2 -C.sub.6), and R.sub.1 and R.sub.2 represent hydrogen or alkyl (C.sub.1 -C.sub.4), are new compounds possessing pharmacodynamic properties and are useful as anti-arrhythmic agents.

Abstract: Isoindolin-1-one derivatives substituted on the nitrogen atom in the 2-position by an unsubstituted or substituted phenyl radical or a heterocyclic radical having aromatic characteristics, substituted in the 3-position by a 3-amino(or substituted amino)-2-hydroxy-propoxy group, and optionally substituted in the 5-and/or 6-positions by one or two alkoxy radicals or optionally substituted in the 5- and 6-positions by a methylenedioxy radical, possess pharmacodynamic properties, and are especially useful as anti-arrhythmic agents.