Hoppe-Seyler's Zeitschrift fuer Physiologische Chemie, , vol. 242, p. 89,94 Yakugaku Zasshi, , vol. 62, p. 417,443;dtsch.Ref.S.122,125 Chem.Abstr., , p. 4724 DE671787 , ; Fortschr. Teerfarbenfabr. Verw. Industriezweige, vol. 25, p. 443 Journal of Scientific and Industrial Research, , vol. 17 B, p. 63,68