1. (a) Kazmierski, W.M., Yamamura, H.I. and Hruby, V.J., J. Am. Chem. Soc., 113 (1991) 2275.
2. Hruby, V.J., Toth, G., Gehrig, C.A., Kao, L. -F., Knapp, R., Liu, G.K., Yamamura, H.I., Kramer, T.H., Davis, P. and Burks, T.F., J. Med. Chem., 34 (1991) 1823.
3. Toth, G., Russell, K.C., Landis, G., Kramer, T.H., Fang, L., Knapp, R., Davis, P., Burks, T.F., Yamamura, H.I. and Hruby, V.J., J. Med. Chem., 35 (1992) 2384.
4. Qian, X., Kövér, K.E., Shenderovich, M.D., Lou, S. -L., Misicka, A., Zalewska, T., Horvath, R., Davis, P., Bilsky, E.J., Porreca, F., Yamamura, H.I. and Hruby, V.G., J. Med. Chem., 37(1994)1746. Haskell-Leuvano, C., Hruby, V.J., manuscript in preparation.
5. (a) Dharanipragada, R., Van Hulle, K., Bannister, A., Bear, S., Kennedy, L. and Hruby, V.J.