In this task, you are given a sentence. You are expected to recognize the name of any form of chemical substances. Although there might be several correct answers, you need to write one of them.

DNA topoisomerase IIalpha (TOP2A) inhibitors up-regulate fatty acid synthase gene expression in SK-Br3 breast cancer cells: in vitro evidence for a 'functional amplicon' involving FAS, Her-2/neu and TOP2A genes.
fatty acid

Neuronal expression of glucosylceramide synthase in central nervous system regulates body weight and energy homeostasis.
glucosylceramide

Determination of dimethylarginine dimethylaminohydrolase activity in the kidney.

dimethylarginine

