Derivatives of the acid methoxy-7a- (1,3-dithietane-carboxamido-2) -cephalosporanic acid having an antibacterial activity and their processes of preparation

A new drug consisting of a beta acid methoxy-7 - (4-substituted methylene-1,3-dithietane-Y1-2) carboxamido 7-alpha-3-heterocyclic thiomethyl DELTA ** 3-cephem-carboxylic acid -4 of the general formula: