230 3 Lipids
Fig. 3.42.Photochemical conversions of provitamin D 3
ring D and the side chain) show these differences
(Formulas 3.104–3.107):
(3.104)β-Sitosterol (24-α-ethyl-cholesterol) (3.105)
Stigmasterol (double bond at C-22) (3.106)Campesterol (24-α-methyl-cholesterol) (3.107)