3-Pyridinecarboxylic acid, 1-ethyl-1,4-dihydro-6-(4-methyl-1-piperazinyl)-4-oxo-, 2-[[(2S,16S,17S,18R,19R,20R,21S,22R,23S)-1,2-dihydro-5,6,9,17,19-pentahydroxy-23-methoxy-2,4,12,16,18,20,22-heptamethyl-8-[(E)-[(4-methyl-1-piperazinyl)imino]methyl]-1,11-dioxo-2,7-(epoxy[1,11,13]pentadecatrienoimino)naphtho[2,1-b]furan-21-yl]oxy]-2-oxoethyl ester AIDS-114256 AIDS114256