Uridine

As one of the four nucleosides used in genetic coding for RNA, uridine contains a pyrimidine base (uracil), which is structurally related to thymidine (linked to a ribose sugar) found in DNA strands. In RNA, the complement to uridine is the nucleoside adenosine and when a phosphate is attached, the nucleotide uridine monophosphate (UMP) is formed.