1PY5:
reference: Synthesis and activity of new aryl- and heteroaryl-substituted 5,6-dihydro-4H-pyrrolo[1,2-b]pyrazole inhibitors of the transforming growth factor-beta type I receptor kinase domain., Sawyer JS, Beight DW, Britt KS, Anderson BD, Campbell RM, Goodson T Jr, Herron DK, Li HY, McMillen WT, Mort N, Parsons S, Smith EC, Wagner JR, Yan L, Zhang F, Yingling JM, Bioorg Med Chem Lett 2004 Jul 5;14(13):3581-4. PMID: 15177479

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