| Member | Definition | Role |
|---|
| aminopenicillanic acid | A penicillanic acid compound having a (6R)-amino substituent. The active nucleus common to all penicillins, it may be substituted at the 6-amino position to form the semisynthetic penicillins, resulting in a variety of antibacterial and pharmacologic characteristics. | 6-aminopenicillanic acid zwitterion; 6-aminopenicillanic acid |
| hypericum | A penicillanic acid having a (6R)-formamido substituent. | 6-formamidopenicillanic acid |
| penicillanic acid | A penam that consists of 3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane bearing a carboxy group at position 2 and having (2S,5R)-configuration. | penicillanic acid |
| sulbactam | | sulbactam |
| tazobactam | A member of the class of penicillanic acids that is sulbactam in which one of the exocyclic methyl hydrogens is replaced by a 1,2,3-triazol-1-yl group; used (in the form of its sodium salt) in combination with ceftolozane sulfate for treatment of complicated intra-abdominal infections and complicated urinary tract infections. | tazobactam |