Agric. BioI. Chem., 46 (8), 2l69~2l72, 1982 ... Department of Agricultural Chemistry, Kyoto Prefectural University, Shimogamo, Kyoto 606, Japan Received March 8, 1982 ... 5) JA Joule and GF Smith, "Heterocyclic Chemistry," Van Nostrand Reinhold Company, London, 1972, p. 50. ...