Polyphenols and diterpenoids from Plectranthus forsteri 'Marginatus'

Polyphenols caffeic acid (1), rosmarinic acid (2), nepetoidins A and B (3) and diterpenoids 7β,6β-dihydroxyroyleanone (4) and 7β-acetoxy-6β-hydroxyroyleanone (5) were identified in the methanolic extract of Plectranthus forsteri 'Marginatus' Benth. 6,7-dehydroroyleanone (6) was isolated from essential oil. The structure was identified using spectroscopic analysis and comparing it to standards.