Chemical Component Summary

Identifiers(2S,5R,6R)-3,3-dimethyl-7-oxo-6-(2-phenylethanoylamino)-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid
FormulaC16 H18 N2 O4 S
Molecular Weight334.39
Isomeric SMILESCC1(C)S[C@@H]2[C@H](NC(=O)Cc3ccccc3)C(=O)N2[C@H]1C(O)=O

Chemical Details

Formal Charge0
Atom Count41
Chiral Atom Count3
Chiral AtomsC3, C5, C6
Bond Count43
Aromatic Bond Count6
Leaving Atomsn/a

Drug Info: DrugBank

DrugBank IDDB01053 Different stereochemistry
  • approved
  • vet_approved
DescriptionBenzylpenicillin (Penicillin G) is narrow spectrum antibiotic used to treat infections caused by susceptible bacteria. It is a natural penicillin antibiotic that is administered intravenously or intramuscularly due to poor oral absorption. Penicillin G may also be used in some cases as prophylaxis against susceptible organisms. Natural penicillins are considered the drugs of choice for several infections caused by susceptible gram positive aerobic organisms, such as <i>Streptococcus pneumoniae</i>, groups A, B, C and G streptococci, nonenterococcal group D streptococci, viridans group streptococci, and non-penicillinase producing staphylococcus. Aminoglycosides may be added for synergy against group B streptococcus (<i>S. agalactiae</i>), <i>S. viridans</i>, and <i>Enterococcus faecalis</i>. The natural penicillins may also be used as first or second line agents against susceptible gram positive aerobic bacilli such as <i>Bacillus anthracis</i>, <i>Corynebacterium diphtheriae</i>, and <i>Erysipelothrix rhusiopathiae</i>. Natural penicillins have limited activity against gram negative organisms; however, they may be used in some cases to treat infections caused by <i>Neisseria meningitidis</i> and <i>Pasteurella</i>. They are not generally used to treat anaerobic infections. Resistance patterns, susceptibility and treatment guidelines vary across regions.
  • (2S,5R,6R)-3,3-Dimethyl-7-oxo-6-(phenylacetamido)-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid
  • 6-(2-phenylacetamido)penicillanic acid
  • Bencilpenicilina
  • Benzylpenicillin
  • Benzylpenicilline
SaltsBenzylpenicillin sodium
Brand Names
  • Bicillin A-P Injection Pws
  • Crystapen
  • Crystapen 1 000 000 Iu Pws
  • Crystapen 10000000 Iu Pws
  • Crystapen
Affected Organism
  • Enteric bacteria and other eubacteria
  • Streptococcus pyogenes
  • Staphylococcus aureus
  • Staphylococcus epidermidis
IndicationFor use in the treatment of severe infections caused by penicillin G-susceptible microorganisms when rapid and high penicillin levels are required such as in the treatment of septicemia, meningitis, pericarditis, endocarditis and severe pneumonia.
PharmacologyPenicillin G is a penicillin beta-lactam antibiotic used in the treatment of bacterial infections caused by susceptible, usually gram-positive, organisms. The name "penicillin" can either refer to several variants of penicillin available, or to the group of antibiotics derived from the penicillins. Penicillin G has <i>in vitro</i> activity against gram-positive and gram-negative aerobic and anaerobic bacteria. The bactericidal activity of penicillin G results from the inhibition of cell wall synthesis and is mediated through penicillin G binding to penicillin binding proteins (PBPs). Penicillin G is stable against hydrolysis by a variety of beta-lactamases, including penicillinases, and cephalosporinases and extended spectrum beta-lactamases.
Mechanism of actionBy binding to specific penicillin-binding proteins (PBPs) located inside the bacterial cell wall, penicillin G inhibits the third and last stage of bacterial cell wall synthesis. Cell lysis is then mediated by bacterial cell wall autolytic enzymes such as autolysins; it is possible that penicillin G interferes with an autolysin inhibitor.
Route of administration
  • Intramuscular
  • Intramuscular; Intrapleural; Intrathecal; Intravenous
  • Intramuscular; Intravenous
  • Intramuscular; Intravenous; Topical
  • Intravenous
  • Amides
  • Anti-Bacterial Agents
  • Anti-Infective Agents
  • Antiinfectives
  • Aza Compounds
  • J01CE01
  • S01AA14
CAS number61-33-6
Drug Info/Drug Targets: DrugBank 3.0: a comprehensive resource for 'omics' research on drugs. Knox C, Law V, Jewison T, Liu P, Ly S, Frolkis A, Pon A, Banco K, Mak C, Neveu V, Djoumbou Y, Eisner R, Guo AC, Wishart DS. Nucleic Acids Res. 2011 Jan; 39 (Database issue):D1035-41. | PMID:21059682