This diagram depicts the chemical structure of pyrimidine, a six-membered aromatic ring with two nitrogen atoms at positions 1 and 3 (highlighted in blue). The remaining positions are occupied by ...

Carbohydrates (also known as sugars) are molecules consisting of a basic unit, usually a six-membered ring, containing carbon and oxygen, either alone (monosaccharides) or joined together ...

First, the chemists used a [3 + 2] cycloaddition between distibene and diazoolefins to make diazadistiboylidenes—five-membered rings that contain two antimony atoms, two nitrogen atoms ...

Nitrogen heterocycles are structures of atoms organized in a ring that contain at least one nitrogen atom, the most common of ...