Anti-inflammatory Ursane- and Oleanane-Type Triterpenoids from
Vitex negundo var. cannabifolia
A−F (1−6), and eight known triterpenoids, 7−14, were
isolated from the leaves of Vitex negundo var. cannabifolia. The
absolute configuration of cannabifolin A (1) was determined
by single-crystal X-ray crystallographic analysis. Compounds 1
and 2 represent a class of rare natural pentacyclic triterpenoids
bearing cis-fused C/D rings and are the first examples of 12,19-
epoxy ursane- and oleanane-type triterpenoids. Compounds 3,
7, 8, and 14 exhibited inhibition of nitric oxide production in lipopolysaccharide-induced RAW 264.7 macrophages with IC50
values in the range 24.9−40.5 μM