And a benzene ring contains carbon and H atoms. And so it makes this very hydrophobic and very nonreactive. Now, if we look at tyrosine and tryptophan tyrosine contains the relatively electronegative oxygen and the relatively electronegative nitrogen. And that's exactly why these are slightly less hydrophobic and slightly more reactive than the phenyl Alameine because of the presence of these relatively electronegative atoms. But because we have these relatively large ring structures, these are still hydrophobic, they're still relatively non reactive as compared to these other amino acids, as we'll see in just a moment. So these are our eight hydrophobic side chains.