Ciba Patent: DE702063 , 1938 ; DRP/DRBP Org.Chem. Full Text Show Details Reichstein; Meystre Helvetica Chimica Acta, 1939 , vol. 22, p. 728,737 Full Text Show Details Kathol; Logemann; Serini Naturwissenschaften, 1937 , vol. 25, p. 682 Full Text View citing articles Show Details Ciba Patent: CH202847 , 1937 ; Full Text Show Details Ciba Pharm. Prod. Inc. Patent: US2267257 , 1938 ; Full Text Show Details Ruzicka; Hofmann Helvetica Chimica Acta, 1937 , vol. 20, p. 1280