| abstract |
The invention relates to a process for the preparation of novel pyridazino & 4,5-b! -Quinoxaline-5,10-dioxyd derivatives of the formula I in which R is C 1-18 alkyl, C 1-6 alkoxy, optionally substituted C 6-6 aryl, Phenyl- / C 1-31 cycloalkyl or a 5- or 6-membered heterocyclic group containing one or two nitrogen and / or oxygen and / or sulfur atoms, or a biologically suitable acid addition salt a basic compound of general formula I. The new compounds have a weight gain and feed utilization improving effect. Formula I |