- Synthesis and histone deacetylase inhibitory activity of cyclic tetrapeptides containing a retrohydroxamate as zinc ligand. Nishino, N., Yoshikawa, D., Watanabe, L.A., Kato, T., Jose, B., Komatsu, Y., Sumida, Y., Yoshida, M. Bioorg. Med. Chem. Lett. (2004)