Terpeno-p-hydroxybenzoic acid derivatives from Rapanea umbellata

The leaves of Rapanea umbellata yielded three terpeno-p-hydroxybenzoic acid derivatives which appear to be novel. These compounds were identified on the basis of spectroscopic analysis as 3-geranyl-4-hydroxy-5-(3″,3″-dimethylallyl)-benzoic acid; 5-carboxy-7-(3″,3″-dimethylallyl)- 2-(1′-hydroxy-1′,5′-dimethylhex-4′-enyl)-2,3-dihydrobenzofuran and 6-carboxy-8-(3″,3″- dimethylallyl)-3α-hydroxy-2α-methyl-2-(4′-methylpent-3′-enyl)-3,4-dihydrobenzopyran.