... Nucleosides & Nucleotides, 12: 841–846. ... The UV spectra of the N 1 -3-deazapurine nucleoside isomers showed a maximum peak at 274 nm (57 and 59), while the N 3 -isomers showed a ... These results are similar to those obtained with other 3-deazapurine nucleosides[25]25. ...