Scabronine A, a novel diterpenoid having potent inductive activity of the nerve growth factor synthesis, isolated from the mushroom, Sarcodon scabrosus - Ohta,T.; Kita,T.; Kobayashi,N.; Obara,Y.; Nakahata,N.; Ohizumi,Y.; Takaya,Y.; Oshima,Y. (Tetrahedron Lett, 1998)