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))-
N-[(3S,4E)-3-Hydroxy-7-mercapto-1-oxo-4-heptenyl]-D-valyl-D-cysteinyl-(2Z)-2-amino-2-butenoyl-L-valine, (4-1) Lactone, Cyclic