What compound is the human body unable to synthesize, but is essential in lowering blood pressure and blood levels of harmful lipids?

Taurine, or 2-aminoethanesulfonic acid, is a compound that is produced naturally in the human body. Found in high levels in the skeletal and heart muscles, & white blood cells & central nervous system. It's essential component in bile & aids in digestion of fats and the absorption of vitamins that are fat-soluble. 2-aminoethanesulfonic acid is also found in seaweed, fungi and bacteria -compound in bile that allow fats & oils to be absorbed- essential development central nervous system & retina. 

the backbone of the dna and rna compound is sugar phosphate.