FORTILSETNING, OG FREMGANGSMAATE FOR FREMSTILLING DERAV.

摘要

Compounds of formula Ia or Ib 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, CCl or Calkyl, can be administrated to healthy animal to increase weight gain or meat, egg or wool production. For each example, they may be administered in the form of a long-acting composition.