... Please enable JavaScript to use all the features on this page. Advances in Heterocyclic Chemistry. Volume 9, 1968, Pages 165–209. Edited By AR Katritzky and AJ Boulton. ... J. Am. Chem. Soc., 80 (1958), p. 5201. 16; H. Weidiger, J. Kranz; Chem. ... 18; M. Ohta; J. Pharm. Soc. ...