5,12-Naphthacenedione, 8-(1,2-dihydroxyethyl)-7,8,9,10-tetrahydro-6,8,11-trihydroxy-1-methoxy-10-[[2,3,6-trideoxy-3-(4-thiomorpholinyl)-.alpha.-L-lyxo-hexopyranosyl]oxy]- NSC376755