435 / | HD | CHEMISTRY: MOLECULAR BIOLOGY AND MICROBIOLOGY |
41 | DF | MICRO-ORGANISM, TISSUE CELL CULTURE OR ENZYME USING PROCESS TO SYNTHESIZE A DESIRED CHEMICAL COMPOUND OR COMPOSITION {26} |
43 | DF | .~ Preparing compound having a 1-thia-4-aza-bicyclo (3.2.0) heptane ring system (e.g., penicillin, etc.) {3} |
46 | .~.~ In presence of phenyl acetic acid or phenyl acetamide or their derivatives |