penicilloic acid

noun
pen·i·cil·lo·ic acid | \ ˌpen-ə-sə-ˌlō-ik- \

Medical Definition of penicilloic acid 

: any of several acids having the general formula RCONH(C6H10NS)(COOH)2 which are obtained from the penicillins by hydrolytic opening of the lactam ring (as by the action of a beta-lactamase)

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