2,3-Di-exo-methylencepham 2,3-Dxme 5-Thia-1-azabicyclo(4.2.0)octane-2-carboxylic acid, 3,4-bis(methylene)-8-oxo-7-((2-thienylacetyl)amino)-, diphenylmethyl ester, (6R-(6alpha,7beta))- 80366-21-8