the most active member of the new cephalosporins was 7- ( o-aminomethylphenylacetamido ) -3- ( 6-hydroxypyridazin-3-ylthilmethyl ) -3-cephem- 4-carboxylic acid ( bb-s 150 ) ( 1g ) which has in vitro antibacterial activity superior to cephalothin and cefazolin against both gram-negative and gram-positive organisms .
C0279516
antibacterial
C0007546
cefazolin