4RFW:
reference: Conformationally Defined Rexinoids and Their Efficacy in the Prevention of Mammary Cancers., Atigadda VR, Xia G, Deshpande A, Wu L, Kedishvili N, Smith CD, Krontiras H, Bland KI, Grubbs CJ, Brouillette WJ, Muccio DD, J Med Chem. 2015 Oct 8;58(19):7763-74. doi: 10.1021/acs.jmedchem.5b00829. Epub, 2015 Sep 22. PMID: 26331194

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