Oxiranecarboxylic acid, 3-[[[1-[[[4-[[5-(hexahydro-2-oxo-1H-thieno[3,4-d]imidazol-4-yl)-1-oxopentyl]amino]butyl]amino]carbonyl]-3-methylbutyl]amino]carbonyl]-, [3aS-[3aα,4β[R*(2R*,3R*)],6aα]]-