A compound of the formula:
wherein B is a purin-9-yl group or a heterocyclic isostere of a purin-9-yl group; or a pyrimidin-1-yl group or a heterocyclic isostere of a pyrimidin-1-yl group; A is -CH- or A-G taken together is -C(=O)-, -C(=CH₂)-, -C(OH)(CH₂OH)- or
and G and D are functional groups; or a pharmaceutically acceptable salt or ester thereof.
式中的化合物:
其中 B 是
嘌呤-9-基团或
嘌呤-9-基团的杂环异构体;或
嘧啶-1-基团或
嘧啶-1-基团的杂环异构体;A 是-CH-或 A-G 合起来是-C(=O)-、-C(=CH₂)-、-C(OH)(CH₂OH)-或
且 G 和 D 为官能团;或其药学上可接受的盐或酯。