Certain benzothiazole compounds

摘要

An oxazetidine derivative compound of the formula: <IMAGE> wherein R1 represents a substituted or unsubstituted amino radical and R3 represents a radical selected from the group consisting of carboxy, protected carboxy, ester, acid amide, acid anhydride, acid halide, acid azide and carboxy salt, and -SR2 is a residue of a thiophilic sulphur nucleophile.