Sambunigrin, obtained from leaves of the elder tree ( " Sambucus nigra " ), is isomeric to prunasin.
2.
All parts of the plant except for the flowers and ripe berries ( but including the ripe seeds ) are poisonous, containing the cyanogenic glycoside sambunigrin ( C 14 H 17 NO 6, CAS number 99-19-4 ).
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