L-Valine, N-(3-hydroxy-7-mercapto-1-oxo-4-heptenyl)-D-valyl-D-cysteinyl-(Z)-2,3-didehydro-2-aminobutanoyl-, xi-lactone, cyclic (1-2)-disulfide, (S-(E))-
L-Valine, N- (3-hydroxy-7-mercapto-1-oxo-4-heptenyl)valyl- cysteinyl-2, 3-didehydro-2-aminobutanoyl-,xi-lactone, cyclic (1-2)-disulfide