6α-fluoro-17α-hydroxy-16α-methylandrosta-4,9(11)-dien-3-one 17β-carboxylic acid 17-butyrate 、 butyric anhydride, 6α-fluoro-17α-hydroxy-16α-methylandrosta4,9(11)-dien-3-one 17β-carboxylic acid 17-butyrate 生成 6α-Fluoro-17α-hydroxy-16α-methylandrosta-4,9(11)-dien-3-one 17β-carboxylic acid methyl ester 17-butyrate