(25S)-25,27-Dihydrophysalin A 1H-7,15b-Epoxy-3,5-(epoxyethano)naphtho[2',1':6,7]cyclonona[1,2,3-cd]benzofuran-1,6,13,18(4H,10H)-tetrone, 2a,3,5,5a,7,7a,8,13a,13b,14,15,15a-dodecahydro-7,8,15a-trihydroxy-2a,5,13a,17-tetramethyl- AIDS-142821 AIDS142821 NSC661114 Physalin O