Compounds of formula (I) are inhibitors of neutrophil elastase, wherein A is C—R
1
or N; -X
1
-X
2
- is CR
15
═N— or —NR
19
—CO—; and R
1
-R
6
, R
15
and R
16
are as defined in the claims.
式(I)的化合物是中性粒细胞
弹性蛋白酶的
抑制剂,其中A为C—R1或N;-X1-X2-为CR15═N—或—NR19—CO—;R1-R6、R15和R16如权利要求中所定义。