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Folium cum Flore Crataegi
noid derivatives in the leaves are epi-catechin (epi-catechol) and/or catechin
(catechol), and the related procyanidins formed during condensation
of 2–8 monomeric units of the above catechins (19–22), together with
oligomeric procyanidins (23). The presence of simple phenolic acids (e.g.
chlorogenic and caffeic acids) has also been reported. Of the non-phenolic
constituents, pentacyclic triterpenes (e.g. ursolic and oleanolic acids)
and the 2-α-hydroxy derivative of oleanolic acid, known as crataegolic
acid, are among the characteristic components (4). The structures of the
characteristic constituents are presented below.
R
hyperoside H
X
Gal
spiraeoside Glc H
rutin H Rha-Glc
vitexin R = H
vitexin 2"-rhamnoside R = Rha
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