Chapter 12, Problem 12.55P

DHA is a fatty acid derived from fish oil and an abundant fatty acid in vertebrate brains. Hydrogenation of DHA forms docosanoic acid $\left[{\text{CH}}_{\text{3}}{\left({\text{CH}}_{\text{2}}\right)}_{\text{20}}{\text{CO}}_{\text{2}}\text{H}\right]$ and ozonolysis forms ${\text{CH}}_{\text{3}}{\text{CH}}_{\text{2}}\text{CHO}$, ${\text{CH}}_{\text{2}}{\left(\text{CHO}\right)}_{\text{2}}$ (five equivalents), and ${\text{HCOCH}}_{\text{2}}{\text{CH}}_{\text{2}}{\text{CO}}_{\text{2}}\text{H}$. What is the structure of DHA if all double bonds have the Z configuration?