4-Thia-1-azabicyclo(3.2.0)heptane-2-carboxylic acid, 6-(((hexahydro-1H-azepin-1-yl)methylene)amino)-3,3-dimethyl-7-oxo-, 2-oxopropyl ester, (2S-(2alpha,5alpha,6beta))- 75027-15-5