The essential oil of Piper regnellii (Miq.) C. DC. var. pallescens (C. DC.) Yunck Piparaceae leaves, which were collected at a tree farm named Horto de Plantas Medicinais of the Universidade Estadual de Maringá, was obtained by hydrodistillation. A preliminary analysis by GC/MS was carried out. b-mirceno (70%) was identified as the main constituent by comparing MS and 13C NMR with the literature data. Four neolignans were isolated from the leaves and identified: eupomatenoid-6, eupomatenoid-5, eupomatenoid-3 and conocarpan. Their structures were established by extensive ¹H and 13C NMR, ¹H x ¹H - COSY, HETCOR, HMBC, gNOE and MS spectral studies.
Piper regnellii; Piperaceae; neolignans; essential oil; GC/MS
