1-(2,3,5-Trideoxy-5-(L-methionyl)amino-beta-D-glycero-pent-2-enofuranosyl)cytosine 70515-18-3 Cytidine, 5'-((2-amino-4-(methylthio)-1-oxobutyl)amino)-2',3'-didehydro-2',3',5'-trideoxy-, (S)-