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  1. 2019New_Mesh_Tree_Hierarchy.txt 
    https://www.nlm.nih.gov/.../download/2019New_Mesh_Tree_Hierarchy.txt
    ... 069.920 Urocanic Acid D02.241.081.114 Butyrates D02.241.081.114.500 Aminobutyrates D02.241. ... 045.500 Acetic Acid D10.251.400.143 Butyrates D10.251.400.143.500 Butyric Acid D10. ...
  2. pdfNLM Technical Bulletin, no.117-128 
    https://www.nlm.nih.gov/.../nlmarchives/techbull/117-128-1979.pdf
    ... 96-4 ETHYL BROMIDE 105-54-4 ETHYL BUTYRATE 75-CO-3 ETHYL CHLORIDE 541-41-3 ... BUTYL ACETATE 105-54-4 ETHY El L BUTYRATE 105-56-6 C 1 YAN'OACETI ! C ... 21-[4[p(bis(2- chloroethyl)ammo)phenyl]butyrate] Ester of chlorambucil and predmsolone, combination alkylating agent ...