62893-19-0 (ANHYD) 62893-20-3 (SODIUM) AIDS-007646 AIDS007646 Cefobid Cefoperazone [6R-[6.alpha.,7.beta.(R*)]]-7-[[[[(4-Ethyl-2,3-dioxo-1- piperazinyl)carbonyl]amino](4-hydroxyphenyl)acetyl]amino]-3-[[(1- methyl-1H-tetrazol-5-yl)thio]methyl]-8-oxo-5-thia-1-azabicyclo[4. 2.0]oct-2-