3'-azido-2',3'-dideoxy-5-(N-15-(6-(3,5-dimethylphenylthio)-5-ethyl-1-(5-oxopentyl)uracil)-4,15-diaza-3-oxopentadecanyl)uridine
3'-azido-2',3'-dideoxy-5-(n-15-(6-(3,5-dimethylphenylthio)-5-ethyl-1-(5-oxopentyl)uracil)-4,15-diaza-3-oxopentadecanyl)uridine