(2S,3S,2'R,3'R)-3'-(3,5-Dihydroxy-phenyl)-4-[(2S,3S,4R,5S)-4-(3,5-dihydroxy-phenyl)-2,5-bis-(4-hydroxy-phenyl)-tetrahydro-furan-3-yl]-2,2'-bis-(4-hydroxy-phenyl)-2,3,2',3'-tetrahydro-[3,4']bibenzofuranyl-6,6'-diol AIDS-106438 AIDS106438 Kobophenol A