1QXK:
reference: Identification of a monoacid-based, cell permeable, selective inhibitor of protein tyrosine phosphatase 1B., Xin Z, Liu G, Abad-Zapatero C, Pei Z, Szczepankiewicz BG, Li X, Zhang T, Hutchins CW, Hajduk PJ, Ballaron SJ, Stashko MA, Lubben TH, Trevillyan JM, Jirousek MR, Bioorg Med Chem Lett 2003 Nov 17;13(22):3947-50. PMID: 14592481

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