NSC686039 Pyrimidine-5-carbonitrile, 1-(2,3,4,6-O-tetraacetyl- .beta.-D-galactopyranosyl)-2-[(2,3,4,6-O-tetraacetyl- .beta.-D-galactopyranosyl)thio]-4-(4-chlorophenyl)- 1,6-dihydro-6-oxo-