• aqueous
  • Bicillin L-A contains penicillin G benzathine in aqueous suspension with sodium citrate buffer and, as w/v, approximately 0.5% lecithin, 0.6% carboxymethylcellulose, 0.6% povidone, 0.1% methylparaben, and 0.01% propylparaben. (rxlist.com)
  • chemically
  • Penicillin G benzathine is prepared by the reaction of dibenzylethylene diamine with two molecules of penicillin G. It is chemically designated as (2S, 5R, 6R )-3,3-Dimethyl-7-oxo-6(2-phenylacetamido)-4-thia-1-azabicyclo[3.2.eptane-2-carboxylic acid compound with N,N' dibenzylethylenediamine (2:1), tetrahydrate. (rxlist.com)