Text this: 1-(5-ACETYL-3-METHYL-6-PHENYL-5H-[1,2,4]TRIAZOLO [3,4-b][1,3,4]THIADIAZIN-7-YL)-ETHANONE: DOSE-DEPENDENCE OF ANALGESIC EFFECT, LACK OF OPIOIDERGIC MECHANISM OF ACTION, EFFECT ON BEHAVIORAL REACTIONS AND ACUTE TOXICITY