The synthesis of optically active 17\b\-tert butoxy-3-methoxy-7\a\(or 7\b\), 18-dimethy-1,2,5(10) estratriene
CAI ZUYUN;NI YUAN;SHEN JINGKANG;YU XINDI;WANG YANQIU
Acta Chimica Sinica . 1986, (1): 78 -83 .