Structures of Plant Growth Inhibitors in Seeds ofCucurbita pepoL

Abstract
Structures of five plant growth inhibitors isolated from seeds of Cucurbita pepo L. were elucidated, and shown to be 9,10-dihydroxy-12-octadecenoic acid (1), its methyl ester (2), (1S,2S,3S)-3-hydroxy-2-(2′-cis-pentenyl)-cyclopentane-1-acetic acid (3, named cucurbic acid), 3-O-β-d-glucopyranosylcucurbic acid (4) and methyl 3-O-β-d-glucopyranosylcucurbate (5).