| ≥1 piece |
Melting point 168 ℃ (crystal containing 1.5 mol of water), the boiling point of 250 ℃ (0.01 mm Hg), specific rotation 135 ° (chloroform, C = 1.2). Soluble in benzene and chloroform. Ergosterol by ultraviolet radiation, place a series of changes, to produce vitamin D2; ergosterol derivatives 22, 23 - two h after ultraviolet irradiation of ergosterol, converted to vitamin D4.