<unk>  is a broad-spectrum penicillin antibiotic. It is active against both Gram-negative and some Gram-positive bacteria. Unlike most other extended spectrum penicillins, it is excreted by the liver, therefore it is useful for biliary tract infections, such as ascending colangitis.
Mezlocillin
Azlocillin
Tulathromycin
Cethromycin
Vancomycin 
Midecamycin
Meropenem
Plicamycin