Isolation and Crystal Structure of Limonidilactone—a Labdane Diterpene From Vitex limonifolia

Abstract

The structure of a new labdane diterpene, limonidilactone , from the leaves of Vitex limonifolia Wall. ( Verbenaceae ) has been established by spectroscopic methods and a single-crystal X-ray structure determination. Crystals are orthorhombic, P2₁2₁2₁, a 19.373(10), b 10.871(7), c 8.207(3) Ǻ, Z 4. Diffractometer data were refined by full-matrix least-squares techniques to a residual of 0.043 for 1436 independent 'observed' reflections.