The process by which penicillin, a class of antibiotics, is produced by microorganisms.
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(2S,5R,6R)-3,3-Dimethyl-7-oxo-6-(2-phenoxy-acetylamino)-4-thia-1-aza-bicyclo[3.2.0]heptane-2-carboxylic acid 4-methoxy-benzyl ester
