Abstract The 2-(4-nitrophenyl) ethoxycarbonyl (npeoc) group, introduced 1984 as protecting group for exocyclic amino functions of nucleic-acid bases, reacts with amines under mild conditions to urea derivatives. Treatment of 2′, 5′-di-O-acetyl-N 6-[2-(4-nitrophenyl)
![3'-deoxy-N6-[2-(4-nitrophenyl)ethoxycarbonyl]adenosine Structure](https://image.chemsrc.com/caspic/380/112237-60-2.png)
