Abstract
The comprehensive phytochemical investigation of the Callicarpa nudiflora resulted in the isolation of a new labdane diterpenoid 16(R/S)-3,4-seco-11E,13E-labdien-15,16-olide-3-al (2), together with sixteen known compounds: two sesquiterpenoids (1R,3S,4R,5S,9S)-3,4-epoxy-5-hydroxy-8(13)-caryophyllen (1), and 4β,10α-aromadendranediol (3), eight labdane analogues (4–11), a pimarane-type diterpenoid (12), three flavonoids (13–15), and two lignans (16, and 17). The structures were elucidated by extensive NMR and HRESIMS analysis. This marks the first comprehensive report of the NMR data of compound 1, as well as the absolute configurations of compounds 1 and 3. The chemotaxonomic significance of the isolated compounds was also discussed. Compounds 1, 3, 14, 16, and 17 were being reported from the genus Callicarpa for the first time, while 3,4-seco-labdane diterpenoids 4–11 were previously obtained only from C. nudiflora.
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