62893-19-0,Cefoperazone,[6R-[6alpha,7beta(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-ene-2-carboxylic acid