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  1. 2019New_Mesh_Tree_Hierarchy.txt 
    https://www.nlm.nih.gov/.../download/2019New_Mesh_Tree_Hierarchy.txt
    ... 940.800.575.912.250.350.650.300 Castor Bean B01.650.940.800.575.912.250.350. ...
  2. pdfNLM Technical Bulletin, no.117-128 
    https://www.nlm.nih.gov/.../nlmarchives/techbull/117-128-1979.pdf
    ... 2 CARBOXYMETHYL HYDROXrETHYL CELLULOSE 9000-40-2 CARCB BEAN GUM 9000-07-1 CARRAGEENIN GUM 499-75-2 CARVACROL 99-49-0 CARVONE 8001-79-4 CASTOR OIL 120-80-9 CATECHOL 145-94-8 ...