Oxazolidone derivative

An oxazolidone derivative represented by the following general formula (I) or a pharmacologically acceptable salt thereof:

• ##STR132## wherein A and B each represents a nitrogen atom, a sulfur atom or an oxygen atom, with the proviso that at least one of A and B must be a nitrogen atom,
• R.sup.1 represents a hydrogen atom, a halogen atom, a cyano group, a lower alkyl group, a cycloalkyl group having 3 to 10 carbon atoms, benzoyloxymethyl, 1-hydroxy-3-hydroxyiminopropyl, a hydroxyalkyl group, an alkoxyalkyl group, a cyanoalkenyl group, a group represented by the formula:
• ##STR133## in which n and m each represents 0 or an integer of 1 to 4, and R.sup.3 and R.sup.4 may be the same or different from each other and each represents a hydrogen atom, a hydroxyl group, a lower alkyl group, a lower alkoxyl group, or a group represented by the formula:
• ##STR134## in which R.sup.7 and R.sup.8 may be the same or different from each other and each represents a hydrogen atom or a lower alkyl group, or R.sup.7 and R.sup.8 may form a ring together with the nitrogen atom to which they are bonded and the ring may be substituted, a group represented by the formula:
• ##STR135## in which p and q each represents 0 or an integer of 1 to 4 and X represents an oxygen atom, a sulfur atom or a group represented by the formula:
• =N--OR.sup.9, R.sup.9 being a hydrogen atom or a lower alkyl group, a group represented by the formula:
• ##STR136## in which R.sup.5 and R.sup.6 may be the same or different from each other and each represents a hydrogen atom, a lower alkyl group or a cyanoalkyl group, or R.sup.5 and R.sup.6 may form a ring together with the nitrogen atom to which they are bonded and the ring may be substituted, or a group represented by the formula:
• NC--(CH.sub.2).sub.r --Y--(CH.sub.2).sub.s --,
• in which r and s each represents 0 or an integer of 1 to 4, and Y represents an oxygen atom, a sulfur atom or a group represented by the formula:
• --NH--, an aryl group which may be substituted, an arylalkyl group which may be substituted, a heteroaryl group which may be substituted, a heteroarylalkyl group which may be substituted, a carbamoylalkyl group or a cyanoalkylcarbamoyl group, wherein heteroalkyl is a saturated or unsaturated 5 to 7-membered ring having 1 or 2 nitrogen, sulfur or carbon atoms,
• R.sup.2 represents a hydrogen atom or a lower alkyl group, and the bond represented by ---- represents a single or double bond.