(r)-3-hydroxybutanoate
4-methyl-2-oxopentanoate
Cholesterol
Creatine
Diphosphate
Glycerol
Glycine
Hexadecanoic acid
Hypoxanthine
L-aspartate
L-glutamate
L-glutamine
L-isoleucine
L-kynurenine
L-leucine
L-lysine
L-phenylalanine
L-proline
L-tryptophan
L-tyrosine
L-valine
Pyruvate
Quinolinate
Salicylate
Urate