Acetic acid (3S,5S,9R,10S,13R,14R,17R)-10,13-dimethyl-17-[(R)-1-methyl-3-(toluene-4-sulfonyloxy)-propyl]-2,3,4,5,6,9,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-3-yl ester 在
potassium carbonate 、 sodium iodide 作用下,
生成
stigmasta-7,25-dien-3β-ol