Studies on steroidal plant-growth regulator IX: THE preparation of 22R- and 22S-24, 25, 26, 27, 28-penta-nor-brassinolides
TIAN WEISHENG;ZHOU WEISHAN;JIANG BIAO;PAN XINFU
Acta Chimica Sinica . 1989, (10): 1017 -1021 .