This means that the stereochemistry of the hydroxyl group at the 3' position is maintained during the chemical reaction. The 'down' configuration means that the hydroxyl group remains in the same orientation.
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Benzoic acid (2R,3R,5S)-2-[3-(2-methoxy-ethoxymethyl)-2,4-dioxo-3,4-dihydro-2H-pyrimidin-1-yl]-5-trityloxymethyl-tetrahydro-thiophen-3-yl ester
2-(1-benzyl-2-phenyl-ethoxysulfonyl)-benzoic acid 2-(2-methoxy-ethoxy)-ethyl ester
N-[(2-methylphenyl)phenylsulfonio]-N-[(4-methylbenzene)dioxosulfanyl]aminylene
2,5-Morpholinedione,3,6-dimethyl-,(3R-trans)-(9CI)
