3IWW:
reference: Bioisosterism of urea-based GCPII inhibitors: Synthesis and structure-activity relationship studies., Wang H, Byun Y, Barinka C, Pullambhatla M, Bhang HE, Fox JJ, Lubkowski J, Mease RC, Pomper MG, Bioorg Med Chem Lett. 2009 Oct 24. PMID: 19897367

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