1. C.F. Boehringer and Soehne, G.m.b.H., Brit. Pat., 795,606 (May 28, 1958); C.A., 53 (1959) 232A.
2. W. Aumüller, G. Korger and H. Wagner, Ger. Pat., 1,014,099 (Aug. 22, 1957); C.A., 53 (1959) 19978.
3. Thin-layer chromatography of N-(p-toluenesulfonyl)-carbamates