Estra
基本解释
- 葉斯特拉
英汉例句
- Purpose To prepare trenbolone acetate in five steps from estra 4,9 diene 3,17 dione. Methods Estra 4,9 diene 3,17 dione(1) was treated with methanol in the presenece of p? toluenesulfonic acid to give 3,3?
目的 由雌甾 4,9 二烯 3 ,1 7 二酮 (1 )經五步郃成醋酸群勃龍 (6)。