.beta.-D-Galactopyranose, 1-thio-, 2,3,4,6-tetraacetate 1-(dimethylarsinite) 1-THIO-.BETA.-D-GALACTOPYRANOSE, 2,3,4,6-TETRAACETATE 1-(DIMETHYLARSINITE) 66981-37-1 NSC256437