<span class="separated-list-container"><span class="separated-list col-lg-12 col-xl-6"><span class="separated-list-item"><a class="classyfire-taxnode" data-content="Purines that carry a C=O group at position 6. Purine is a bicyclic aromatic compound made up of a pyrimidine ring fused to an imidazole ring." href="http://classyfire.wishartlab.com/tax_nodes/C0001505" rel="noopener" target="_blank">6-oxopurines</a></span><span class="list-separator"> / </span><span class="separated-list-item"><a class="classyfire-taxnode" data-content="Naturally occurring chemical compounds that contain mostly basic nitrogen atoms. This group also includes some related compounds with neutral and even weakly acidic properties. Also some synthetic compounds of similar structure are attributed to alkaloids. In addition to carbon, hydrogen and nitrogen, alkaloids may also contain oxygen, sulfur and more rarely other elements such as chlorine, bromine, and phosphorus." href="http://classyfire.wishartlab.com/tax_nodes/C0000279" rel="noopener" target="_blank">Alkaloids and derivatives</a></span><span class="list-separator"> / </span><span class="separated-list-item"><a class="classyfire-taxnode" data-content="Compounds that contain a pyrimidine ring, which bears a ketone. Pyrimidine is a 6-membered ring consisting of four carbon atoms and two nitrogen centers at the 1- and 3- ring positions." href="http://classyfire.wishartlab.com/tax_nodes/C0000291" rel="noopener" target="_blank">Pyrimidones</a></span><span class="list-separator"> / </span><span class="separated-list-item"><a class="classyfire-taxnode" data-content="Organic compounds containing an amine group, which is indirectly attached to a carbonyl via an intervening vinyl (&gt;C=C&lt;) moiety." href="http://classyfire.wishartlab.com/tax_nodes/C0003890" rel="noopener" target="_blank">Vinylogous amides</a></span><span class="list-separator"> / </span><span class="separated-list-item"><a class="classyfire-taxnode" data-content="Compounds containing an imidazole ring, which is an aromatic five-member ring with two nitrogen atoms at positions 1 and 3, and three carbon atoms." href="http://classyfire.wishartlab.com/tax_nodes/C0000078" rel="noopener" target="_blank">Imidazoles</a></span><span class="list-separator"> / </span><span class="separated-list-item"><a class="classyfire-taxnode" data-content="Compounds containing an aromatic ring where a carbon atom is linked to an hetero atom." href="http://classyfire.wishartlab.com/tax_nodes/C0004144" rel="noopener" target="_blank">Heteroaromatic compounds</a></span><span class="list-separator"> / </span><span class="separated-list-item"><a class="classyfire-taxnode" data-content="Compounds containing two amine groups joined by a carbonyl (C=O) functional group." href="http://classyfire.wishartlab.com/tax_nodes/C0000517" rel="noopener" target="_blank">Ureas</a></span><span class="list-separator"> / </span><span class="separated-list-item"><a class="classyfire-taxnode" data-content="Compounds containing a lactam ring, which is a cyclic amide of amino carboxylic acids, having a 1-azacycloalkan-2-one structure (or an analogue having unsaturation or heteroatoms replacing one or more carbon atoms of the ring)." href="http://classyfire.wishartlab.com/tax_nodes/C0000160" rel="noopener" target="_blank">Lactams</a></span><span class="list-separator"> / </span><span class="separated-list-item"><a class="classyfire-taxnode" data-content="Organic compounds containing an heterocycle with at least one nitrogen atom and one carbon atom linked to each other." href="http://classyfire.wishartlab.com/tax_nodes/C0004139" rel="noopener" target="_blank">Azacyclic compounds</a></span><span class="list-separator"> / </span><span class="separated-list-item"><a class="classyfire-taxnode" data-content="Compounds containing a bond between carbon a pnictogen atom. Pnictogens are p-block element atoms that are in the group 15 of the periodic table." href="http://classyfire.wishartlab.com/tax_nodes/C0004557" rel="noopener" target="_blank">Organopnictogen compounds</a></span></span></span><span class="hidden-taxonomy" style="display: none"><span class="list-separator"> / </span><span class="separated-list-container"><span class="separated-list col-lg-12 col-xl-6"><span class="separated-list-item"><a class="classyfire-taxnode" data-content="Organic compounds containing a bond between a carbon atom and an oxygen atom." href="http://classyfire.wishartlab.com/tax_nodes/C0000323" rel="noopener" target="_blank">Organooxygen compounds</a></span><span class="list-separator"> / </span><span class="separated-list-item"><a class="classyfire-taxnode" data-content="Organic compounds containing a nitrogen atom." href="http://classyfire.wishartlab.com/tax_nodes/C0000278" rel="noopener" target="_blank">Organonitrogen compounds</a></span><span class="list-separator"> / </span><span class="separated-list-item"><a class="classyfire-taxnode" data-content="Organic compounds containing an oxide group." href="http://classyfire.wishartlab.com/tax_nodes/C0003940" rel="noopener" target="_blank">Organic oxides</a></span><span class="list-separator"> / </span><span class="separated-list-item"><a class="classyfire-taxnode" data-content="Derivatives of hydrocarbons obtained by substituting one or more carbon atoms by an heteroatom. They contain at least one carbon atom and heteroatom." href="http://classyfire.wishartlab.com/tax_nodes/C0004150" rel="noopener" target="_blank">Hydrocarbon derivatives</a></span></span></span></span><a class="taxonomy-toggler" href="javascript:void();"><div class="drugbank-icon icon-expand"><svg class="icon" role="img" title="expand">
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