7-ACYLAMINO-3-((3-(CARBOXYMETHYL) THIO-1 H-1,2,4-TRIAZOL-5-YL) THIOMETHYL)-3-CEPHEM-4-CARBOXYLIC ACID DERIVATIVES, PROCESSES FOR THEIR PREPARATION AND COMPOSITIONS CONTAINING THEM

摘要

The invention provides [(4,5-dihydro-5-thioxo-1H-1,2,4-triazol-3-yl)thio]acetic acid, its alkali metal and ammonium salts. The compounds are useful as intermediates in cephalosporin synthesis.