Chemical composition and biological activity of leaf exudates from some Lamiaceae plants.

Leaf exudates from 39 species, belonging to 26 genera of Lamiaceae, have been isolated and their antibacterial and antiviral activity investigated. Some of the active compounds (ursolic acid, siderol and nepetalactone) were isolated and identified, most of them for the first time in the investigated plants. Some chemotaxonomic conclusions were drawn.