Barbituric acid

The keto-enol equilibrium ensures that this molecule (like all the molecules of this page) may adopt different structures:

Derivatives of barbituric acid are used to treat epilepsy and some insomnia.

The pyrimidine bases:

These are the structural elements of DNA and RNA that carry the genetic code

In DNA, thymine and cytosine are attached to the deoxyribose, whereas in RNA uracil is attached to the ribose:

Thus, for example, thymidine and uridine are structural elements of DNA respectively RNA. These structural elements are linked by phosphate groups to form DNA or RNA chains:

DNA portion (Reading from 5' to 3 ): Thymine - Thymine - Cytosine