Abstract: A piperazine derivative of the formula: ##STR1## wherein R.sup.1 is hydrogen, alkyl (C.sub.1-8), alkyl (C.sub.1-4)-sulfonyl or an acyl group of the formula: R.sup.3 CO--(wherein R.sup.3 is hydrogen, alkyl (C.sub.1-7), halogenoalkyl (C.sub.1-4), alkoxy (C.sub.1-4)-carbonyl-alkyl (C.sub.1-4), cycloalkyl (C.sub.3-6), alkenyl (C.sub.2-5), alkoxy (C.sub.1-4), amino, alkyl (C.sub.1-4)-amino or anilino), R.sup.2 is hydrogen, alkyl (C.sub.1-4), alkoxy (C.sub.1-4)-carbonyl-alkyl (C.sub.1-4), carboxy-alkyl (C.sub.1-4), alkenyl (C.sub.2-5) or alkyl (C.sub.1-4)-sulfonyl, or R.sup.1 and R.sup.2 are combined together to form succinyl group, Ring A is phenyl, alkyl (C.sub.1-4)-phenyl or halogenophenyl, and n is an integer of 2 to 6, or a pharmaceutically acceptable acid addition salt thereof. The piperazine derivative (I) has an intracranial pressure-lowering activity. Said derivative also has a depressing effect on central nervous system.

Abstract: A triazafluoranthene compound of the formula: ##STR1## wherein R.sup.1 is hydrogen, phenyl, cycloalkyl having 3 to 6 carbon atom, (lower alkoxy)carbonyl, lower alkoxy or (lower alkyl)carbonyl, R.sup.2 is hydrogen or lower alkyl, R.sup.3 is hydrogen, phenyl, (lower alkoxy)carbonyl, lower alkoxy, di(lower alkyl)amino, (tetrahydropyran-2-yl)oxy, hydroxy or carboxyl, A is single bond, alkylene having one to 5 carbon atoms or alkenylene having 2 to 5 carbon atoms, and B is single bond or alkylene having one to 5 carbon atoms. Methods of preparing the compound (I) are disclosed. The compound (I) and a pharmaceutically acceptable acid addition salt thereof have a potent anti-anoxic activity.

Abstract: An azepino[1,2,3-lm]-.beta.-carboline compound of the formula: ##STR1## wherein R.sup.1 is hydrogen, cycloalkyl of 3 to 7 carbon atoms, phenyl, hydroxy, alkoxycarbonyl of 2 or 3 carbon atoms or alkanoyl of 2 or 3 carbon atoms, and A is single bond or straight or branched alkylene of one to 5 carbon atoms. Several methods of preparing the compound [I] are disclosed. The compound [I] and a pharmaceutical acceptable acid addition salt thereof have a potent anti-anoxic activity.

Abstract: N-(2-amino-5-nitrobenzoyl)-o-toluidine is condensed with fluoroacetic acid or a functional derivative thereof. N-(2-fluoroacetamido-5-nitrobenzoyl)-o-toluidine obtained by said condensation reaction is dehydrated to produce 2-fluoromethyl-3-(o-tolyl)-6-nitro-4(3H)-quniazolinone, which is then subjected to reduction reaction. 2-fluoromethyl-3-(o-tolyl)-6-amino-4(3H)-quinazolinone thus obtained and a pharmaceutically acceptable acid addition salt thereof are useful as central muscle relaxants, minor tranquilizers, anti-convulsants, analgesics and/or anti-inflammatory agents.