7-Epiclusianone, a tetraprenylated benzophenone, relaxes airway smooth muscle through activation of the nitric oxide-cGMP pathway - Coelho, L P; Serra, M F; Pires, A L; Cordeiro, R SB; Rodrigues e Silva, P M; dos Santos, M H; Martins, M A (J Pharmacol Exp Ther, 2008)