The compounds: ##STR1## in which the dotted line represents optional unsaturation; R.sup.1 is hydrogen, halo or alkoxy; R.sup.2 is hydrogen or alkoxy and X is methylene, ethylene, ethylidene, 1,2-propylene or propylene; or a biologically acceptable salt thereof are growth promoting agents which rapidly lead to increased lean body mass in domestic animals and humans.
化合物:##STR1## 其中虚线代表可选不饱和;R.sup.1代表氢、卤素或烷氧基;R.sup.2代表氢或烷氧基,X代表亚甲基、
乙烯基、乙基亚甲基、1,2-丙二基或
丙二烯基;或其
生物学上可接受的盐,是促进生长的剂,可快速导致家畜和人类的瘦体重增加。