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Structures of uterotonic agents isolated from plants. The chemical structures of kaurenoic acid (1), grandifloric acid (2), kauradienoic acid (3), Z-venusol (4), 5-hydroxymethylfurfural (5), linoleic acid (6), pennogenin (7) (the scaffold for pennogenin glycosides) and β-sitosterol (8) are shown.
