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chemical resistance compound chemistry molecular drawing composition antibacterial bacteria infection antimicrobial antibiotic molecule allergic allergy atoms microorganism atomic transpeptidase drug clavulanic carbon bacterium sulfur nitrogen hydrogen bactericidal model resistant blue pink structure medicine treatment background pharmacology medication microbiology organic study pharmaceuticalPenicillin, Antibiotic Drug, Structural Chemical Formula Royalty-Free Stock Photo
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Penicillin, antibiotic drug, Structural chemical formula #280747197
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