A compound of the formula (I) wherein X
1 ? is bond or —O(CH
2
)
m
— (in which m is an integral number of 1, 2 or 3); X
2
is bond, —(CH
2
)
n
—, etc. (in which n is an integral number of 1, 2 or 3); R
1
is hydrogen or amino protective group; R
2
is hydroxy(lower)alkyl or (lower)alkoxy(lower)alkyl; A is phenyl, pyridyl, indolyl or carbazolyl, each of which may be substituted with one or two substituent(s) selected from the group consisting of halogen, hydroxy, lower alkyl, etc.; and B is phenyl or pyridyl, each of which may be substituted with one or two substituent(s) selected from the group consisting of halogen, hydroxy, nitro, etc.; and a pharmaceutically acceptable salt thereof which is useful as a medicament.
1
化合物的
化学式(I)中,其中X1是键或—O(
CH2)m—(其中m是1、2或3的整数);X2是键,—( )n—等(其中n是1、2或3的整数);R1是氢或
氨基保护基;R2是羟基(较低)烷基或(较低)烷氧(较低)烷基;A是苯基、
吡啶基、
吲哚基或
咔唑基,每种基可能被取代为一个或两个来自卤素、羟基、较低烷基等的取代基;B是苯基或
吡啶基,每种基可能被取代为一个或两个来自卤素、羟基、硝基等的取代基;以及其药学上可接受的盐,可用作药物。