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  1. 2019New_Mesh_Tree_Hierarchy.txt 
    https://www.nlm.nih.gov/.../download/2019New_Mesh_Tree_Hierarchy.txt
    ... 233.348 Fluorescent Dyes D27.720.233.674 Food Coloring Agents D27.720.233.837 Hair Dyes ... D27.720.361 Flame Retardants D27.720.372 Food Ingredients D27.720.372.300 Food Additives D27. ...