2,7-(Epoxy[1,11,13]pentadecatrienoimino)naphtho[2,1-b]furan-1,6,11(2H,9H)-trione, 21-(acetyloxy)-8-amino-5,17,19-trihydroxy-9-imino-23-methoxy-2,4,12,16,18,20,22-heptamethyl-, (2S,16S,17S,18R,19R,20R,21S,22R,23S)- 3-Amino-4-deoxo-4-imino-rifamycin S AIDS-113918 AIDS113918