4.2.1.B7 (9S,10E,12Z)-9-hydroperoxy-10,12-octadecadienoate generation of (8Z)-colneleic acid from the (8R)-deuterated (9S)-hydroperoxide is accompanied by retention (98%) of most of the deuterium label 407611 4.2.1.B7 (9S,10E,12Z)-9-hydroperoxy-10,12-octadecadienoate - 407612 4.2.1.B7 (9S,10E,12Z,15Z)-9-hydroperoxy-10,12,15-octadecatrienoate - 407616 4.2.1.B7 additional information irrespective of which hydroperoxide regioisomer served as the substrate, divinyl ether synthases abstracting the pro-R hydrogen generate divinyl ethers having an (E)-vinyl ether double bond, whereas enzymes abstracting the pro-S hydrogen produce divinyl ethers having a (Z)-vinyl ether double bond 89