A compound of formula 1
##STR1##
wherein: R1 is C1-C4-alkyl; R2 is
C1-C4-alkyl; and R3 is C1-C4-alkyl
or phenyl, each optionally mono- or polysubstituted, or R2 and R3
together are —CH2—CH2— or —CH2—CH2—CH2—,
or the corresponding acid addition salt with a pharmacologically acceptable acid,
processes for preparing such compounds, pharmaceutical compositions containing
such compounds, and their use in the treatment of inflammatory and obstructive
respiratory diseases.
