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note
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One serious drawback of 13 is an inevitable use of ephedrine. Since the latter is the direct synthetic precursor of methamphetamine, its use is severely restricted in many countries.
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53
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2742555174
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note
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Essentially in the same manner, Tietze explained the stability of the (Z)-isomer over the (E)-isomer in the 6-benzylideneoxazepane-5,7-dione 13. See ref. 34b.
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