(2S,16S,17S,18R,19R,20R,21S,22R,23S)-5,6,17,19-Tetrahydroxy-23-methoxy-2,4,12,16,18,20,22-heptamethyl-1,11-dioxo-9-(1-piperazinyl)-1,2-dihydro-2,7-(epoxy[1,11,13]pentadecatrienoimino)naphtho[2,1-b]furan-21-yl acetate AIDS-113751 AIDS113751