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Chem. Penicillin, <Princeton 1949>, S. 921, 945
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Crooks
Chem. Penicillin, <Princeton 1949>, S. 455, 468
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Upjohn Co.
Patent: US2480079 , 1945 ;
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Bloch; Clarke
Journal of Biological Chemistry, 1938 , vol. 125, p. 283