1. Novello, F. C., and Sprague, M., J. Amer. Chem. Soc., 79, 2028 (1957).
2. Pitts, R. F., J. Pharmacol. Exp. Therap., 123, No. 2, 89 (1958).
3. Chem. Eng. News, 36, 53 (1958).
4. Drug Trade News, 32, No. 23, 68 (1957).
5. Aston, R., and Hags, H. W., Fed. Proc., 15, 394 (1956).