CRYSTALLINE (6R,7R)-7-{2-(5-AMIN0-[1 ,2,4] THIADIAZOL-3-YL)-2-[(Z)­ TRITYLOXYIMINO]-ACETYLAMINO }-3- [(R)-l'-TERT-BUTOXYCARBONYL-2-0XO­ [1,3']BIPYRROLIDINYL-(3E)­ YLIDENEMETHYL ]-8-0X0-5-THIA-1 -AZA­ BICYCL0[4.2.0]0CT-2-ENE-2-CARBOXYLIC ACID BENZHYDRYL ESTER; ITS MANUFACTURE AND USE