Richtzenhain Chemische Berichte, 1948 , vol. 81, p. 260,265 Full Text Show Details Sugasawa; Kakemi J. pharm. Soc. JpaanChem.Abstr., 1937 , vol. 57, p. 172,177; engl. Ref. S. 24 J. pharm. Soc. JpaanChem.Abstr., 1939 , p. 9307