Compounds of formula la or lb
wherein R is alkyl; R1 is alkyl, alkoxycarbonylamino or acylamino; NR2R3 is mono- or di-substituted amino or a heterocyclic ring; R4 is H, alkoxycarbonyl, alkenyl, cycloalkyl or acyl; X is N or CH; and Y is N, CH, CBr, CCI or Calkyl, can be administered to healthy animals to increase weight gain or meat, egg or wool production. For example, they may be administered in the form of a long-acting composition.
式 la 或 lb 的化合物
其中 R 是烷基;R1 是烷基、烷氧羰基
氨基或酰
氨基;NR2R3 是单或二取代
氨基或杂环;R4 是 H、烷氧羰基、烯基、环烷基或酰基;X 是 N 或 CH;Y 是 N、CH、CBr、CCI 或烷基。例如,可以长效组合物的形式给药。