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It was found that the different pharmacological indices (kindly made available by Dr. S. Fürst [1]) depend on each other. The indices are toxicity (LD50 in mg/kg), hot plate test*(ED50 in mg/kg, see [7]), algolytic test**(ED50 in mg/kg, see [2]) and the narcotic potentiating effect (ED500% in mg/kg, see [3].) All experiments were per