this paper is the last of a set reporting an investigation of the kinetics of jejunal uptake and inhibitory ability of a series of neutral dipeptides , glycylglycine , l-ananyl-l-alanine , l-valyl-l-valine and l-leucyl-l-leucine , with progressively longer and more lipophilic side chains .
C0012512
dipeptides
C0017984
glycylglycine