RETRACTED: Design and synthesis of CHAP31, trapoxin B and HC-toxin based bicyclic tetrapeptides disulfide as potent histone deacetylase inhibitors

This article has been retracted: please see Elsevier Policy on Article Withdrawal (http://www.elsevier.com/locate/withdrawalpolicy).This article has been retracted at the request of the Authors.Some of the data reported in the article were previously published in the paper of Toru Arai, Md. Ashraful Hoque, Norikazu Nishino, Hyun-Jung Kim, Akihiro Ito and Minoru Toshida in Amino Acids, 45 (2013) 835–843. DOI 10.1007/s00726-013-1527-8.The authors would like to apologize for this administrative error on their part.