12-oxophytodienoic acid [ 12-oxo-PDA,12-oxo-cis-10, cis-15-phytodienoic acid,12-oxo-phytodienoic acid,12-oxophytodienoate,OPDA acid,8-(2-(cis-2'-pentenyl)-3-oxo-cis-4-cyclopentenyl)octanoic acid ] structure given in first source; a jasmonate precursor that induces phytoalexin synthesis