5YSY:
reference: Effects of 2-substitution on 14-epi-19-nortachysterol-mediated biological events: based on synthesis and X-ray co-crystallographic analysis with the human vitamin D receptor., Sawada D, Kakuda S, Takeuchi A, Kawagoe F, Takimoto-Kamimura M, Kittaka A, Org Biomol Chem. 2018 Apr 4;16(14):2448-2455. doi: 10.1039/C8OB00158H. PMID: 29560490

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