👉 The term "pyrimidyl" is a name given to a type of enzyme found in bacteria. It is also known as a pyrimidine dehydrase, which means it uses nucleotides (adenosine, thymine, cytosine, and uracil) as substrates. This enzyme catalyzes the hydrolysis of pyrimidines, which are organic molecules containing pyrimidines, to form purines (adenine, thymine