Abstract: The invention relates to biologically active novel compounds having formula (I) as defined herein. Also disclosed are methods of preparing said compounds, fungicidal compositions comprising, as an active ingredient, these compounds, use of the compounds, and method of controlling fungi at loci infested or liable to be infested therewith.

Abstract: The present invention relates to [1,2,4]triazolo[4,3-a]quinoxalinone compounds of the formula ##STR1## wherein R.sup.1 is POX'X" or alkyl substituted with COX' or POX'X", and X' and X" independently are hydroxy or alkoxy, and R.sup.7 is trifluoromethyl, and R.sup.6, R.sup.8 and R.sup.9 independently are piperidino, piperazinyl, morpholino, or thiomorpholino, which rings are optionally substituted with one or more of phenyl or C.sub.1-6 -alkyl and phenyl optionally being substituted with C.sub.1-6 -alkoxy; and pharmaceutically acceptable salts thereof. The compounds of the present invention are useful in the treatment of indications caused by hyperactivity of the excitatory neurotransmitters.