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Synthesis and Crystal Structure of 2-Fluoro-4-methyl-3-oxo-4-aza-5α-androst-1-ene-17β-carboxylic Acid Methyl Ester<Author>JANG Yin-Zhi XIANG Zuo LIANG Da-Wei (Department of Applied Chemistry, Zhejiang Sci-Tech. University, Hangzhou 310018, China)<