.beta.-D-Xylopyranoside, (3.beta.,4.beta.,5 .alpha.,6 .alpha.,15.beta.,22E,24R,25S)-3,4,6,8,15-pentahydroxyergost-22-en-26-yl 2-O-(2-O-methyl-b-D-xylopyranosyl)-, 3-(sodium sulfate) AIDS-168488 AIDS168488 Certonardoside D