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
, R
15
and R
19
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—;而R1-R6、R15、R15和R19如索赔中所定义。