: a penicillin C13H18N2O4S2 that is similar to penicillin G in antibiotic activity but that is obtained by growing the penicillia in a culture medium that contains a precursor
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“Penicillin O.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/penicillin%20O. Accessed 23 May. 2025.
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