Phospholipid studies of marine organisms 9. New brominateddemospongic acids from the phospholipids of two petrosia species

Two Novel long chain fatty acids, (5Z, 9Z)-6-bromo-25-methyl-5,9-hexacosadienoic and (5Z, 9Z)-6-bromo-24-methyl-5,9-hexacosadienoic acids were found in the phospholipids of $\text{Petrosia}$$\text{ficiformis}$ and $\text{P.}$$\text{hebes}$. Their structures were elucidated with the help of CI-EI7MS and a homogeneous hydrogenation catalyst.