title: Nonose
text: # Nonose
  
  A nonose is a monosaccharide with nine carbons.
  
  ## Nonoses types
  
  Depending on the position of the functional groups, a distinction is made between ketononoses and aldononoses.
  
  Aldononoses have seven chiral centers, which allows the formation of 128 stereoisomers $(2^7),$ which differ in the position of the hydroxyl groups or the asymmetric carbon atom. Ketononoses have six chiral centers, which gives the possibility of 64 different possible stereoisomers.
  
  ## Nonoses families
  
  * Neuraminic acid
  * Sialic acid
  * Legionaminic acid
  * Pseudaminic acid
  