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  1. pdf2018MeShTreeHierarchy.pdf 
    https://www.nlm.nih.gov/mesh/2018/download/2018MeShTreeHierarchy.pdf
    ... 500.490...........................................Guaiac D20.215.721.500.626...........................................Mastic Resin D20.215.721.500.762...........................................Propolis D20. ...