Synthesis and chemical study: Inoue, Yukawa, J. Agric. Chem. Soc. Jpn. 16, 504 (1940); Ichim et al., Igiena 9, 319 (1960), C.A. 55, 16662a (1961). Activity as a urease inhibitor: Kobashi et al., Biochim. Biophys. Acta 65, 380 (1962); 227, 429 (1971); as an antimicrobial: Hase et al., Chem. Pharm. Bull. 19, 363 (1971).