Cholesterol Campesterol Sitosterol Stigmasterol 甾醇结构及碳原子编号顺序甾醇结构及碳原子编号顺序 9 11 12 13 14 8 17 16 15 10 5 6 7 1 2 3 4 HO 19 18 20 23 22 26 25 24 21 27 HO HO HO 24 25 26 27 28 28 29 22 23 28 29 Cholesterol Campesterol Sitosterol Stigmasterol