A compound represented by formula (1):
wherein R
1
is a substituent represented by formula (2):
wherein R
2
is ═O or —NH
2
, with the proviso that when R
2
is ═O, H is attached to the 1-position N of the pyrimidine ring, and the bond between the 1-position N and the 6-position C is a single bond; or a substituent represented by formula (3):
wherein R
3
is —OH, ═O, or —NH
2
, with the proviso that when R
3
is —OH or —NH
2
, R
4
is H; when R
3
is ═O, R
4
is —NH
2
; and when R
3
is ═O, H is attached to the 1-position N of the purine ring, and the bond between the 1-position N and the 6-position C is a single bond.
一种由式(1)表示的化合物:其中R1是由式(2)表示的取代基:其中R2为 ═O或—NH2,但是当R2为═O时,H附着在
嘧啶环的1位N上,并且1位N和6位C之间的键为单键;或者由式(3)表示的取代基:其中R3为—OH,═O或—NH2,但是当R3为—OH或—NH2时,R4为H;当R3为═O时,R4为—NH2;当R3为═O时,H附着在
嘌呤环的1位N上,并且1位N和6位C之间的键为单键。