This is this fingersine that acts as a platform molecule that attaches all these other components. So one example of a single lipid that we're going to find around the membranes of nervous cells. So nerve cells is basically a finger myelin molecule. And in this particular case, the nitrogen is attached onto that carboxylic acid of that particular fatty acid. So this bond is basically this bond here. And notice unlike in this case where we have two of these fatty acids, we only have one fatty acid in this particular case.