noun
(pharmacology) The penicillin C₁₆H₁₈N₂O₄S that constitutes the principal or sole component of most commercial preparations and is used chiefly in the form of its stable salts (as the sodium salt C₁₆H₁₇N₂NaO₄S or potassium salt C₁₆H₁₇KN₂O₄S).
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