 4"Z",7"Z",10"Z",13"Z",16"Z"-docosapentaenoic acid) and "all"-"cis"-7,10,13,16,19-docosapentaenoic acid (i.e.7"Z",10"Z",13"Z",16"Z",19"Z"-docosapentaenoic acid).They are also commonly termed n-6 DPA and n-3 DPA, respectively; these designations describes the position of the double bond being 6 or 3 carbons closest to the (omega) carbon at the methyl end of the molecule and is based on the biologically important difference that n-6 and n-3 PUFA are separate PUFA classes, i.e.