Xanthopterin Hydrate is isolated from butterfly wings and could replace folic acid in the nutrition of many animal species.

Ethylmalonic acid can be found in blood cerebrospinal fluid (CSF) and urine as well as in human fibroblasts prostate and skeletal muscle tissues. Moreover ethylmalonic acid is found to be associated with anorexia nervosa and malonyl-CoA decarboxylase deficiency. Ethylmalonic acid is a non-carcinogenic potentially toxic compound.

2-amino-4-methyl-1,3-thiazole-5-carbohydrazide is a compound used as a molecular building block.