Heterosides are condensates of monosaccharides with one or more non-carbohydrate constituents (aglycones) that can be separated by hydrolysis:
Coniferin
Substance contained in conifers and in wild celery (medicinal plant)
Angelica archangelica
Salicin
Substance with anti-inflammatory properties contained in the bark of white willows
Salix alba
Hesperidin
Antihemorrhagic substance contained in lemons and oranges Condensate of rutinol with hesperitol aglycone
Digitoxin
Cardiotonic substance contained in the Foxgloves Condensate of a polysaccharide with digitoxigenin aglycone
Digitalis purpurea
The tannins
Prototype of a gallotanin
Astringent substances contained in the bark of many plants, esters of an ose with eg gallic acid (gallotanins) Formerly used in leather tanning to form leather
Tanning
Sinigrin
Substances contained in black mustard
Black mustard seeds
Amygdalin
Substance contained in seeds of apricot, apple, pear, plum and bitter almond , already highlighted by the chemist Liebig. Hydrolysis during digestion releases very toxic $HCN$ hydrogen cyanide!
Bitter almonds