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3-epi-Vitamin D3 (Epicholecalciferol) (Compound 4), a Vitamin D3 analogue, is a Hedgehog pathway inhibitor with an IC50 of 39.2 μM measured in U87MG cells[1].

[1] Banerjee U, et al. Evaluation of vitamin D3 A-ring analogues as Hedgehog pathway inhibitors. Bioorg Med Chem Lett. 2012 Feb 1;22(3):1330-4. DOI:10.1016/j.bmcl.2011.12.081