The present invention relates to a compound of formula I: wherein: R
1
is C
1-6
alkyl, C
3-8
cycloalkyl, aryl, heterocyclyl, or —COR
1x
, where the C
1-6
alkyl, C
3-8
cycloalkyl, aryl, and heterocyclyl may be substituted; and R
1x
is C
3-8
cycloalkyl, aryl, or heterocyclyl, any of which may be substituted; R
2
, R
3
, R
4
, R
5
, R
6
, and R
7
are each independently hydrogen, halogen, C
1-6
alkyl, or aryl, where the C
1-6
alkyl or aryl may be substituted; R
8
is hydrogen, C
1-6
alkyl, aryl, or heterocyclyl, any of which may be substituted; or a pharmaceutically acceptable salt or ester thereof.
本发明涉及一种I式化合物,其中:R1是C1-6烷基,C3-8
环烷基,芳基,杂环基或—COR1x,其中C1-6烷基,C3-8
环烷基,芳基和杂环基可以被取代;而R1x是C3-8
环烷基,芳基或杂环基,任何一个可以被取代;R2、R3、R4、R5、R6和R7各自独立地是
氢、卤素、C1-6烷基或芳基,其中C1-6烷基或芳基可以被取代;R8是
氢、C1-6烷基、芳基或杂环基,任何一个可以被取代;或其药学上可接受的盐或
酯。