.beta.-D-arabino-Hexopyranose, 2-deoxy-1-thio-, 3,4,6-benzoate 1-[ethyl(2-hydroxyethyl)arsinite] 2-DEOXY-1-THIO-.BETA.-D-ARABINO-HEXAPYRANOSE, 3,4,6-BENZOATE 1-[ETHYL(2-HYDROXYETHYL)ARSINITE] NSC298842