How can I draw the structures of the eight aldopentoses? Which are enantiomers?
Note: The configurations at C-4 of L-xylose and L-lyxose should be HO-C-H.
The D- and L-forms of each aldopentose are enantiomers of each other, because they are nonsuperimposable mirror images of each other.
For example, D-ribose and L-ribose are an enantiomeric pair.