Table 3. Natural origin of metabolites associated with rabies volatile fecal metabolome.

Compound Name	Fatty Acid Metabolism1	Food1	GI2	Micro3	Synth/ Enviro4
Benzaldehyde		X	X
2-Butyl-2-octenal		X
2-Ethylhexanoic acid	X	X			X
2-Ethyl-1-hexanol	X	X
Hexanal		X	X
Isobutyric acid	X	X	X	X
Methyl isobutyl ketone		X	X		X
2-Methylquinoline		X
4-Nonanone		X
γ-Nonalactone		X
1-Octen-3-ol		X	X
2-Pentylfuran		X	X
Phenol		X	X		X
Propanoic acid	X	X	X	X
Propanoic acid, 2-methyl-2,2-dimethyl-1-(2-hydroxy-1-methylethyl)propyl ester					X5
Toluene		X	X		X
Unknown compound A
Unknown compound B

¹Endogenous source according to HMBD 4.0 [48]

²Human fecal metabolites associated with gastrointestinal diseases [17]

³Microbiological source according to HMBD 4.0 [48]

⁴Industrial application according to HMBD 4.0 [48]

⁵Family of plasticizers