Namely , when the molecule is drawn in the Fischer projection , the hydroxyls on C - 2 , C - 4 , and C - 5 must be on the right side .
That on C - 3 must be on the left side .
Namely , when the molecule is drawn in the Fischer projection , the hydroxyls on C - 2 , C - 4 , and C - 5 must be on the right side , while that on C - 3 must be on the left side .