NC61499
5′-Cytidylic acid, 2′-deoxy-N-[(1,1-dimethylethoxy)carbonyl]-2′,2′-difluoro-, (7R)-7-(hexyloxy)-1-[(6R)-6-(hexyloxy)-3-methoxy-3-oxido-2,4,8-trioxa-3-phosphatetradec-1-yl]-4-methoxy-4-oxido-3,5,9-trioxa-4-phosphapentadec-1-yl methyl ester, 3′-(1,1-dimethylethyl carbonate)