Proprionamide CH3CH2CNH2 0.66


Urea derivatives These compounds have lower permeability than _

F , r , i n-Butanl CH3CH2CH2CH2OH 0.01 ; amides with the same number of carbons and

11 are about as impermeable as the corresponding O R_NH-C-NH2 dihydroxyl alcohols „.Butryamide CH3CH2CH2C NH2 0.42

1,4-Butanediol CH2OHCH2CH2CH2OH 0.86

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