(2S,3BS,7S,9aR,10aS,12aR)-7-[(2-O-acetylpentopyranosyl)oxy]-2-hydroxy-1-[(5S)-5-(1-hydroxy-1-methylethyl)-2-methyltetrahydrofuran-2-yl]-3a,6,6,12a-tetramethyltetradecahydro-1H-cyclopenta[1,2]phenanthro[4a,4b-b]oxiren-5-yl hexopyranoside AIDS-013390 AIDS013390 Astragaloside II NSC641295