We would like to request a retraction of our paper [1] entitled, "A novel carbamoyloxy arylalkanoyl arylpiperazine compound (SKL-NP) inhibits hyperpolarization-activated cyclic nucleotide-gated (HCN) channel currents in rat dorsal root ganglion neurons" by Gehoon Chung, Tae-hyung Kim, Hyewon Shin, Eunhee Chae, Hanju Yi, Hongsik Moon, Hyun Jin Kim, Joong Soo Kim, Seog Bae Oh, from The Korean Journal of Physiology & Pharmacology. Vol 16 (4) 237-241, 2012.We regret to inform that the published paper included a few parts that disclosed confidential information which should have been protected under patent law. We admit that the request for retraction is due to the indiscretion of the authors, and confirmed that editorial committee of KJPP have not conducted any fault in publishing the paper.