Brown
Chem.Penicillin, <Princeton 1949>, S. 492,507,517
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Merck and Co.Inc.
Patent: US2478047 , 1947 ;

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Butenandt; Jatzkewitz; Schiedrt
Hoppe-Seyler's Zeitschrift fuer Physiologische Chemie, 1948 , vol. 283, p. 209,213