products displaying mutagenicity were also obtained by refluxing creatinine with other hydroxyamino acids such as l-serine , l-homoserine , and l-4-amino-3-hydroxybutyric acid , and aldehydes such as glyoxal , methylglyoxal , glycolaldehyde , but not formaldehyde .
C0001992
aldehydes
C0017992
glyoxal