Antinociceptive Components of Ganoderma lucidum - Koyama, Kiyotaka; Imaizumi, Tooru; Akiba, Michiko; Kinoshita, Kaoru; Takahashi, Kunio; Suzuki, Akira; Yano, Shingo; Horie, Syunji; Watanabe, Kazuo; Naoi, Yukio (Planta Medica, 1997)