Stachyflin and acetylstachyflin, novel anti-influenza A virus substances, produced by Stachybotrys sp. RF-7260. I. Isolation, structure elucidation and biological activities - Minagawa,K.; Kouzuki,S.; Yoshimoto,J.; Kawamura,Y.; Tani,H.; Iwata,T.; Terui,Y.; Nakai,H.; Yagi,S.; Hattori,N.; Fujiwara,T.; Kamigauchi,T. (J Antibiot, 2002)