Polyphenols and diterpenoids from Plectranthus forsteri 'Marginatus'

Abstract Polyphenols caffeic acid ( 1 ), rosmarinic acid ( 2 ), nepetoidins A and B ( 3 ) and diterpenoids 7 β ,6 β -dihydroxyroyleanone ( 4 ) and 7 β -acetoxy-6 β -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.