计rmi The benefits of vitamin a: maintains health of specialized tissues such as the retina aids in growth and health of skin and mucous membranes promotes normal development of teeth soft and skeletal tissue Adult rDa:1000μgRE Fat-soluble 爷ADAM
O HC=CNa/Lig. Nh Beta Ionone CICHCO2C2H5 NaoH HO COOC2H5 HO/OH EtMgBr CHO BrM OMgBr
O Beta Ionone O COOC2H5 ClCH2CO2C2H5 NaOCH3 1 2 H2O/OH CHO O HC CNa / Liq. NH3 HO OH H2SO4 EtMgBr BrMg OMgBr
OH H/Pd OHE OH POCI pyridine OA Retinol acetate 维生素A(视黄醇) 功能与视觉有关,并能维持粘正常功能,调节皮肤状态 缺乏症:夜盲症、眼球干燥,度肤干燥及痕痒 主要食物来源:红萝卜、绿叶蔬菜、蛋黄及肝
OH OH H2/Pd OH OH OAc OH Ac2O POCl pyridine OAc Retinol acetate 维生素A（视黄醇） 功能：与视觉有关，并能维持粘膜正常功能，调节皮肤状态。 缺乏症：夜盲症、眼球干燥，皮肤干燥及痕痒。 主要食物来源：红萝卜、绿叶蔬菜、蛋黄及肝
Vitamin DRps min D2 Vitamin d 19(Ergocalciferol) (Colecalciferol) HO HO The are more than tone kinds of Vitamin D, the most important of which are VD(麦角骨化醇)mnvD3(胆骨化醇
Vitamin D The are more than tone kinds of Vitamin D, the most important of which are VD2 (麦角骨化醇) and VD3 (胆骨化醇) HO H 1 2 3 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 HO H 5 7 8 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 6 9 Vitamin D2 (Ergocalciferol) Vitamin D3 (Colecalciferol) 1 2 3
obtained from the photolysis reaction product of ergosterol n Ergocalciferol, VD2, the first product to be isolated pure, w Ergosterol Vitamin D, (Ergocalciferol
Ergocalciferol, VD2, the first product to be isolated pure, was obtained from the photolysis reaction product of ergosterol. HO H Vitamin D2 (Ergocalciferol) HO uv Ergosterol