Compounds, or pharmaceutically acceptable salts or esters thereof, having a structure of: wherein each of R
1
-R
5
is individually selected from H, halogen, optionally substituted alkyl, optionally substituted alkoxy, nitro, sulfonamide, hydroxy, or amino; and R
6
is selected from H, optionally substituted alkyl, or optionally substituted aryl.
化合物,或其药学上可接受的盐或酯,其结构为:其中R1-R5中的每个都是独立选择自H,卤素,可选取代烷基,可选取代烷氧基,硝基,磺酰胺基,羟基或
氨基; 而R6则选择自H,可选取代烷基或可选取代芳基。