Caudoxirene, the Spermatozoid-Releasing and Attracting Factor in the Marine Brown AlgaPerithalia caudata(Phaeophyceae, Sporochnales)

Abstract
Caudoxirene (cis-3-(1,2-trans-epoxy-but-3-enyl)-4-vinyl-cyclopentene) is a new gamete releasing factor from Perithalia caudata (Sporochnales). Its threshold concentration is found at 30 pmol for gamete release. Multifidene, viridiene and a Z-isomer of caudoxirene were identified as by-products or trace constituents.