Some pyrimidine derivatives, such as pyrithiobac and bispyribac, are used as herbicides to control weeds in agricultural settings. These compounds inhibit the enzyme acetolactate synthase (ALS), which ...

The phosphate groups are closely packed about the axis of the molecule, with the pentose residues surrounding them, and the purine and pyrimidine groups projecting radially, their planes being ...

This image illustrates the chemical structure of a purine molecule, highlighting the numbering of the carbon and nitrogen atoms. The purine structure consists of a pyrimidine ring (positions 1 to 6) ...