Thymine

Thymine
Chemical name	5-Methylpyrimidine-2,4(1H,3H)-dione
Chemical formula	C5H6N2O2
Molecular mass	126.11 g/mol
Melting point	316 - 317 °C
CAS number	65-71-4
SMILES	CC1=CNC(NC1=O)=O

Thymine, also known as 5-methyluracil, is a pyrimidine nucleobase. It is found in the nucleic acid DNA. In RNA thymine is replaced with uracil. Thymine can base pair with adenine.

Thymine combined with deoxyribose creates the nucleoside thymidine. Thymidine can be phosphorylated with one, two or three phosphoric acid groups, creating respectively TMP, TDP or TTP (thymidine mono- di- or triphosphate).