3'-azido-2',3'-dideoxy-5-(N-9-(6-(3,5-dimethylphenylthio)-5-ethyl-1-(5-oxopentyl)uracil)-4,9-diaza-3-oxononanyl)uridine
3'-azido-2',3'-dideoxy-5-(n-9-(6-(3,5-dimethylphenylthio)-5-ethyl-1-(5-oxopentyl)uracil)-4,9-diaza-3-oxononanyl)uridine