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Cytarabine molecule (A) and its ester (B), amide (C), and alkyl (D) prodrugs that were included in a systematic permeation study using COSMOperm calculations. R1 = ethyl (CytO2), butyl (CytO4), hexyl (CytO6), octyl (CytO8), decyl (CytO10), dodecyl (CytO12), tetradecyl (CytO14), and hexadecyl (CytO16); R2 = ethyl (CytN2), butyl (CytN4), hexyl (CytN6), octyl (CytN8), and decyl (CytN10); and R3 = ethyl (CytC2), butyl (CytC4), hexyl (CytC6), octyl (CytC8), and decyl (CytC10).
