Ampicillin Impurity 69

(2R,2'R) -2,2'- ((1R,7R,13R) -1-amino-14- (((5R,6R) -2-carboxy-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptan-6-yl) amino) -2,5,8,11,14-pentaoxo-1,7,13-triphenyl-3,6,9,12-tetraazatetradecane-4,10-diyl) bis (5,5-dimethylthiazolidine-4-carboxylic acid)