Structure-antitussive activity relationships of naltrindole derivatives. Identification of novel and potent antitussive agents. - Sakami,S.; Maeda,M.; Kawai,K.; Aoki,T.; Kawamura,K.; Fujii,H.; Hasebe,K.; Nakajima,M.; Endo,T.; Ueno,S.; Ito,T.; Kamei,J.; et al. (J Med Chem, 2008)