alkaloid 547.72 612.01572 http://id.loc.gov/authorities/subjects/sh85003598 http://purl.bioontology.org/ontology/MESH/D000470 http://purl.bioontology.org/ontology/SNOMEDCT/419001004 http://purl.obolibrary.org/obo/CHEBI_22315 http://purl.obolibrary.org/obo/NCIT_C221 https://en.wikipedia.org/wiki/Alkaloid https://en.wikipedia.org/wiki/Category:Alkaloids https://www.wikidata.org/wiki/Q70702 RM666.A4 Any of the naturally occurring, basic nitrogen compounds (mostly heterocyclic) occurring mostly in the plant kingdom, but also found in bacteria, fungi, and animals. By extension, certain neutral compounds biogenetically related to basic alkaloids are also classed as alkaloids. Amino acids, peptides, proteins, nucleotides, nucleic acids, amino sugars and antibiotics are not normally regarded as alkaloids. Compounds in which the nitrogen is exocyclic (dopamine, mescaline, serotonin, etc.) are usually classed as amines rather than alkaloids. QD421-QD421.7 RS431.A53 QK898.A4 alkaloids organonitrogen compound