**Conflict of interest**

**2.15.** *Tetradenia* **genus**

28 Terpenes and Terpenoids

BaCl2

royleanone (**136**) [99], and ibozol (**217**) [100].

tion activity (MIC7.81 μg/mL) [103], and *M. tuberculosis*[104].

Seven species were recorded in SA, one of them *T. riparia* is widely distributed in Africa and showed interesting chemical profile. Several compounds have been isolated from the leaves of this plant, including 8(14),15-sandaracopimaradiene-7*α*,18-diol (**214**) [97], 8(14), 15-sandaracopimaradiene-2*α*,18-diol (**215**) [98], 9*β*,13*β*-epoxy-7-abietene (**216**), 6,7-dehydro-

Compound (**214**) exhibited antimicrobial activity (**213**). Compound (**215**) showed papaverinelike antispasmodic activity on guinea pig ileum contracted by methacholine, histamine, or

 and on the noradrenaline-induced contractions of rabbit aorta [101]. It also showed activities against *Trichomonasvulgaris* with MIC of 20–40 μg/mL [102], wheat rootlets inhibiThe author declares no conflict of interest to disclose.
