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  1. 2019New_Mesh_Tree_Hierarchy.txt 
    https://www.nlm.nih.gov/.../download/2019New_Mesh_Tree_Hierarchy.txt
    ... 800.575.912.250.859.937.937.888 Urtica dioica B01.650.940.800.575.912.250.875 ... 11 alpha,9 alpha-(epoxymethano)prosta-5 ,13-dienoic Acid D01.248.497.158.685.750.850 ...