... (13) Izumiya, et al., synthesized z z H--L-tys--L-LL-oII I in 87% yield by the NCA method in the heterogeneous system: N. Mit- suyasu, S. Terada, K. Noda, M. Waki, T. Kato, and N. Izumiya, Proceedings of the 8th Symposium on Peptide Chemistry, Osaka, Japan ... J. Org ... Chem., Vol. ...