the most active member of this series was 7- ( o-aminomethylphenylacetamido ) -3- ( tetrazolo- [ 4,5-b ] pyridazin-6-ylthiomethyl ) -3 -cephem-4-carboxylic acid ( bb-s 226 ) ( 24e ) with antibacterial activity superior activity superior to cephalothin and cefazolin .
C0279516
antibacterial
C0007546
cefazolin