Predictive block-matching motion estimation for TV coding. I. Inter-block prediction

2-Sulfinyl (or thio)- alpha -isopropenyl (or isopropylidene)-3-amido(or imido)-4-oxo-1-azetidineacetic acids and esters are prepared directly or indirectly from the reaction of a penicillin sulfoxide ester with an ester of acrylic acid. These compounds are active antimicrobial agents or are intermediates to active antimicrobial compounds.