A compound of formula II
 or a pharmaceutically acceptable salt thereof, wherein:
R2 is
 or
 W is
(a) =O, or
(b) =S;
 X is
(a) -H,
(b) -CH3, or
(c) -OCH3; and
 Y is
(a) -CH3,
(b) -Cl, or
(c) -NO2.
These compounds may be used for treating herpes virus infections.
                            式 II 的化合物
 或其药学上可接受的盐,其中
R2 是
 或
 W 是
(a) =O,或
(b) =S;
 X 是
(a) -H
(b) -
CH3,或
(c) -O   ;以及
 Y 是
(a) -   
(b) -Cl 或
(c) -
NO2。
这些化合物可用于治疗疱疹病毒感染。