Task: Translation
Input (Czech): Zpusob syntézy 1-methyl-3-fenylpiperazinu vzorce II, meziproduktu pro výrobu antidepresiva mirtazapinu vzorce I, spocívá v katalytické hydrogenolýze 1-benzyl-2-fenyl-4-methylpiperazinu.
Output (English): The method for the synthesis of 1-methyl-3-phenylpiperazine of formula II, an intermediate for the preparation of antidepressant mirtazapine of formula I, consists in the catalytic hydrogenolysis of 1-benzyl-2-phenyl-4-methylpiperazine.