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    2. 分子砌塊
      3-chloro-5H-pyrrolo[2,3-b]pyrazine
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      pyrazine-2-sulfonyl chloride
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      2-chloro-5-(difluoromethoxy)pyrazine
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      3-(trifluoromethyl)imidazo[1,5-a]pyrazine
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      (3-chloropyrazin-2-yl)methanamine dihydrochloride
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      (5-methylpyrazin-2-yl)methanamine dihydrochloride
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      2-chloro-3-nitropyrazine
      CAS No.:87885-43-6
      2,5-dibromo-3-nitropyrazine
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      2-chloro-3,5-dimethylpyrazine
      CAS No.:38557-72-1
      2,5-difluoropyrazine
      CAS No.:1207861-11-7
      methyl 6-(trifluoromethyl)pyrazine-2-carboxylate
      CAS No.:1644548-81-1
      2-chloro-3-(trifluoromethyl)pyrazine
      CAS No.:191340-90-6
      3-chloropyrazine-2-carbaldehyde
      CAS No.:121246-96-6
      5-chloropyrazine-2-carbonitrile
      CAS No.:36070-75-4
      methyl 6-chloropyrazine-2-carboxylate
      CAS No.:23611-75-8
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