Erlenmeyer et al. Helvetica Chimica Acta, 1947 , vol. 30, p. 2058,2061 Full Text Show Details Ochiai et al. Yakugaku Zasshi, 1939 , vol. 59, p. 462,468; dtsch. Ref. S. 228, 233 Chem.Abstr., 1954 , p. 0 5449