2-Biphenylpenicillin sodium 2289-50-1 4-Thia-1-azabicyclo(3.2.0)heptane-2-carboxylic acid, 6-(2-biphenylcarboxamido)-3,3-dimethyl-7-oxo-, monosodium salt Ancillin sodium salt Biphenicillin sodium Diphenicillin sodium Penicillin, (2-biphenylyl)-, sodium salt Sodium ancillin Sodium diphenicillin