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Abstract
For two anthracyclinone precursors, 1,4-dihydroxy-2-(1-hydroxy-2,3:4,5-di-0-isopropylidene-D-arabinityl)-9,10-anthraquinone (1) and methyl 2,3-0-isopropylidene-5-(2-quinizarinyl)-α-D-lyxofuranoside (5) prepared by a modification of the Marschalk reaction, single-crystal X-ray analyses indicate that the configurations are both S at the new chiral centres C-1′ and C-5.