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Definitions:
Noun
ampicillin
Principen
Polycillin
SK-Ampicillin
Definition: semisynthetic penicillin (trade names Principen and Polycillin and SK-Ampicillin)
Definition: A semisynthetic form of penicillin C₁₆H₁₉N₃O₄S that is effective against gram-negative and gram-positive bacteria and is used to treat infections of the urinary, respiratory, and intestinal tracts.