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3 10 -helical structure, that of 2 was a -hairpin nucleated by a type II’ -turn like structure,and that of 3 was an S-type turn structure nucleated by type II/III -turns (Figure 2) [6].Fig. 2. Illustrative structures of peptides 1, 2, and 3.AcknowledgmentsThis work was supported in part by a Grant-in-Aid for Young Scientists (B) from the Ministry ofEducation, Culture, Sports, Science and Technology, Japan (MEXT), the Kurata Memorial HitachiScience and Technology Foundation, and the Travel Grant from the Japan Society for the Promotion ofScience (JSPS).References1. (a) Nagano, N., Tanaka, M., Doi, M., Demizu, Y., Kurihara, M., Suemune, H. Org. Lett. 11, 1135-1137 (2009); (b) Tanaka, M., Anan, K., Demizu, Y., Kurihara, M., Doi, M., Suemune, H. J. Am.Chem. Soc. 127, 11570-11571 (2005); (c) Tanaka, M., Demizu, Y., Doi, M., Kurihara, M., Suemune,H. Angew. Chem. Int. Ed. 43, 5360-5363 (2004).2. (a) Demizu, Y., Tanaka, M., Doi, M., Kurihara, M., Okuda, H., Suemune, H. J. Pept. Sci. in press;(b) Demizu, Y., Yamagata, N., Sato, Y., Doi, M., Tanaka, M., Okuda, H., Kurihara, M. J. Pept. Sci.16, 153-158 (2010); (c) Oba, M., Demizu, Y., Yamagata, N., Sato, Y., Doi, M., Tanaka, M.,Suemune, H., Okuda, H., Kurihara, M. Tetrahedron 66, 2293-2296 (2010); (d) Demizu, Y., Shiigi,H., Mori, H., Matsumoto, K., Onomura, O. Tetrahedron: Asymmetry 19, 2659-2665 (2010).3. Demizu, Y., Tanaka, M., Nagano, M., Kurihara, M., Doi, M., Maruyama, T., Suemune, H. Chem.Pharm. Bull. 55, 840-842 (2007).4. (a) Krause, E., Bienert, M., Schmieder, P., Wenschuh, H.L. J. Am. Chem. Soc. 122, 4865-4870(2000); (b) Fairman, R., Anthony-Cahill, S.J., DeGrado, W.F. J. Am. Chem. Soc. 144, 5458-5459(1992).5. (a) Karle, I.L., Hosahudya, G.N., Balaram, P. Proc. Natl. Acad. Sci. U.S.A. 100, 13946-13951(2003); (b) Dhanasekaran, M., Fabiola, F., Pattabhi, V., Durani, S. J. Am. Chem. Soc. 121, 5575-5576 (1999); (c) Haque, T.S., Little, J.C., Gellman, S.H. J. Am. Chem. Soc. 118, 6975-6985 (1996).6. Demizu, Y., Doi, M., Sato, Y., Tanaka, M., Okuda, H., Kurihara, M. J. Org. Chem. 75, 5234-5239(2010).581