2-Amino-2',3'-didehydro-2',3'-dideoxyadenosine

2,6-diaminopurine 2',3'-didehydro-2',3'-dideoxyriboside

9-[[(2R,5S)-2,5-Dihydro-5-(hydroxymethyl)furan]-2-yl]-9H-purine-2,6-diamine