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[1,"Metabolite","Endogenous or microbial small molecules involved in metabolic processes",null,null]
[2,"Drug","Pharmaceutical compounds, approved medications, and investigational drugs",null,null]
[3,"Pollutant","Environmental contaminants and industrial chemicals with toxicological relevance",null,null]
[4,"Nutrient","Dietary components essential or beneficial for human nutrition",null,null]
[5,"Toxin","Naturally occurring or synthetic toxic substances",null,null]
[6,"Hormone","Endocrine signaling molecules (steroid, peptide, amine hormones)",null,null]
[7,"Vitamin","Essential organic micronutrients required in small amounts",null,null]
[8,"Lipid","Fatty acids, glycerolipids, sphingolipids, sterols, and related species",null,null]
[9,"Amino-Acid","Proteinogenic and non-proteinogenic amino acids and their derivatives",null,null]