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The aglycone is azoxy-compound (-C-N=N-O), not cyanohydrin of a

carbonyl compound.
They give HCN only after alkaline hydrolysis, not after acid hydrolysis.

                               Ketonic Cyanohydrin

H3C           H3C              OH  Glucgolusce s
H3C
     C O HCN       C           CN

              H3C

Acetone       Acetone Cyanohydrin                   Linamarin

Aldehydic Cyanohydrin                             Linseed

     O                                 OH         Mandelnitrile
     CH HCN                        CH sugar       Glycosides

                                       CN

Benzaldehyde  Mandelonitril
                                   e

Ketonic Cyanohydrin Glycoside

 Linamarin

Source: Linseed

   Some Important Examples of mandilonitile glycosides :

 1- Amygdalin

It is a D-mandelonitrile gentiobioside

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