1-(2-hydroxyethyl)thymine (2,4(1H,3H)-Pyrimidinedione, 1-(2-hydroxyethyl)-5-methyl-) is a marine derived natural products found in Zoanthus sp.

1-beta-D-Arabinofuranosylthymine (Thymine 1-β-D-arabinofuranoside) is a purine nucleoside analog. Purine nucleoside analogs have a broad spectrum of antitumor activity, targeting inert lymphoid malignancies and inducing apoptosis.1-beta-D-Arabinofuranosylthymine's anticancer mechanism is dependent on the inhibition of DNA synthesis.1-beta-D-Arabinofuranosylthymine is a purine nucleoside analog.

Thymine is one of the four bases of DNA and is able to act as a target for 5-fluorouracil in animal cancer models with Km=2.3 μM.

5-Methyluridine (Thymine riboside) is an endogenous methylated nucleoside found in human fluids; methylated purine bases are present in higher amounts in tumor-bearing patients compared to healthy controls.DNA hypermethylation is a common finding in malignant cells and has been explored as a therapeutic target for hypomethylating agents.

Uracil is a common naturally occurring pyrimidine found in RNA, it base pairs with adenine and is replaced by thymine in DNA. Methylation of uracil produces thymine. Uracil's use in the body is to help carry out the synthesis of many enzymes necessary for cell function through bonding with riboses and phosphates. Uracil serves as allosteric regulator and coenzyme for many important biochemical reactions.

Dihydrothymine, one of the intermediate metabolites of thymine, is derived from plants and animals and is toxic in high concentrations.

2,4-Dihydroxypyrimidine-5-carboxylic acid (Isoorotic acid) has been obtained from 5-formyluracil by the action of enzyme, thymine 7-hydroxylase. 2,4-Dihydroxypyrimidine-5-carboxylic acid has been used to synthesize N1-alkylated uracil derivatives.

(S)-b-aminoisobutyric acid is a non-protein amino acid originating from the catabolism of valine and thymine.

Pyrimidine (Metadiazine)s are heterocyclic, six-membered, nitrogen-containing carbon ring structures, with uracil, cytosine and thymine being the basal structures of ribose-containing nucleosides (uridine, cytidine, and thymidine respectively), or deoxyribose-containing deoxynucleosides, and their corresponding ribonucleotides or deoxyribonucleotides. Pyrimidines serve essential functions in human metabolism as ribonucleotide bases in RNA (uracil and cytosine), and as deoxyribonucleotide bases in DNA (cytosine and thymine), and are linked by phosphodiester bridges to purine nucleotides in double-stranded DNA, in both the nucleus and the mitochondria. Pyrimidine activated sugars are also involved in polysaccharide and phospholipid synthesis, glucuronidation in detoxification processes, glycosylation of proteins and lipids and in the recently identified novel endothelium-derived vasoactive dinucleotides.