vatives        CHEMONTID:0000264</span>
<span class="co">#&gt; 3 class      Carboxylic acids and derivatives     CHEMONTID:0000265</span>
<span class="co">#&gt; 4 subclass   Amino acids, peptides, and analogues CHEMONTID:0000013</span>
<span class="co">#&gt; 5 level 5    Amino acids and derivatives          CHEMONTID:0000347</span>
<span class="co">#&gt; 6 level 6    Alpha amino acids and derivatives    CHEMONTID:0000060</span>
<span class="co">#&gt; 7 level 7    Histidine and derivatives            CHEMONT