The presence of the estolide reported by Bougault and Bourdier and as well as its carboxylic acid esterified with higher alcohol, was detected in the leaf wax of Pinus Thunbergii and they were respectively designated acid and neutral estolides. It was revealed through the present work that this neutral estolide was distributed widely in the estolide-type conifers as leaf-wax component (Table II).
