1H-2,16:10,16a-Dimethanobenzo[8,9]benzofuro[5',4':5,6]cyclonona[1,2,3-cd]benzofuran-1,3(2H)-dione, 15-(3,5-dihydroxyphenyl)-4b,5,10,14,15,16-hexahydro-8,11-dihydroxy-5,14,17,18-tetrakis(4-hydroxyphenyl)- AIDS-135294 AIDS135294 Kobophenol B NSC634723