a crystalline compound, C8H11NO2S, whose bicyclic molecular structure is the nucleus of the penicillins and consists of a β-lactam ring fused to a molecule of 5,5-dimethylthiazolidine-4-carboxylic acid
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Penitsilliinhape (penicilloic acid) on määratletud happena, milles laktaamtsükkel (lactam ring) on lõhustatud nii, et C-N-side on katkenud. Penitsillaanhappes (penicillanic acid) see aga ei ole katkenud, s.t et süsiniku (C) ja lämmastiku (N) vahel esineb keemiline side (nad on ühendatud).
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