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![[Figure 1]](yf3200fig1mag.jpg)
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Figure 1
Upper row: `all-purine' pairs suggested by Wächtershäuser (1988  ). Lower row: purine–purine base pairing motifs of 5-aza-7-deazaguanine 2′-deoxyribonucleoside (2b) with antiparallel (aps) or parallel (ps) strand orientation (Seela et al., 2001). Notes: iGd = 2′-deoxyisoguanosine, dG = 2′-deoxyguanosine and R = β-D-2′-deoxyribofuranosyl. |
![[Figure 1]](yf3200fig1.jpg)
 | STRUCTURAL CHEMISTRY |
ISSN: 2053-2296
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