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  1. 2019New_Mesh_Tree_Hierarchy.txt 
    https://www.nlm.nih.gov/.../download/2019New_Mesh_Tree_Hierarchy.txt
    ... 098.038.290 Apomorphine D03.132.098.057 Berberine Alkaloids D03.132.098.057.100 Berberine D03.132.098.077 Bicuculline D03.132.098. ... 633.400.131 Benzophenanthridines D03.633.400.168 Berberine Alkaloids D03.633.400.168.100 Berberine D03. ...
  2. pdfNLM Technical Bulletin, no.117-128 
    https://www.nlm.nih.gov/.../nlmarchives/techbull/117-128-1979.pdf
    ... 84-0 BENZYLAMINE, ALPHA-METHYL 316-41-6 BERBERINE SULFATE 7440-41-7 BERYLLIUM 7787-47-5 ... headings of each Technical Note will include a reference to the section of the NLM Online Services ...