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11β-Hydroxy-androst-4-en-3,17-dione（1a）,androst-4,9（11）-dien-3,17-dione-（2a）,androst-4-en-3,11,17-trione（3a）,11α-methoxy-androst-4-en-3,17-dione（4a）and 11β-metboxy-androst-4-en-3,17-dione（Sa）were selectively reduced tothe corresponding 17β-OH derivatives