4J3J:
reference: Design and synthesis of 4-(2,4,5-trifluorophenyl)butane-1,3-diamines as dipeptidyl peptidase IV inhibitors., Zhu L, Li Y, Qiu L, Su M, Wang X, Xia C, Qu Y, Li J, Li J, Xiong B, Shen J, ChemMedChem. 2013 Jul;8(7):1104-16. doi: 10.1002/cmdc.201300104. Epub 2013 May, 13. PMID: 23671024

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