2-Hydroxyphenethylamine has been found in human testicle tissue and has also been primarily detected in blood. 2-Hydroxyphenethylamine can be converted into 2-(hydroxymethyl)-4-(1-hydroxy-2-{[6-(4-phenylbutoxy)hexyl]amino}ethyl)phenol.

5-Phenylvaleric acid is a pentanoic acid of bacterial origin occasionally found in human biofluids.

Cytosine is a pyrimidine base that is a fundamental unit of nucleic acids. The deamination of cytosine alone is apparent and the nucleotide of cytosine is the prime mutagenic nucleotide in leukaemia and cancer.