1β-Methylseleno-N-acetyl-D-galactosamine
In organic chemistry, 1β-Methylseleno-N-acetyl-D-galactosamine is an amino sugar containing selenium. It is found in urine, as a disposal metabolite for selenium.
Source: Wikipedia — 1β-Methylseleno-N-acetyl-D-galactosamine (CC BY-SA 4.0)