Melting Point 105-106 °C
Vitamin D5, a member of the family Vitamin D which was discovered by Edward Mellanby in 1919 during his classic experiments with rickets, is about 180-fold less active than vitamin D3, in calcification of rachitic cartilage and about 100- to 200-fold less active in induction of bone calcium mobilization. In stimulation of intestinal-calcium transport, vitamin D5 is about 80 fold less active than vitamin D3.
1. Arch Biochem Biophys. 1979 Oct 1;197(1):119-25. Synthesis of vitamin D5: its biological activity relative to vitamins D3 and D2. Napoli JL, Fivizzani MA, Schnoes HK, DeLuca HF.