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.

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

A: glucosylceramide
****
Q: Enhancement of radiosensitivity by topoisomerase II inhibitor, amrubicin and amrubicinol, in human lung adenocarcinoma A549 cells and kinetics of apoptosis and necrosis induction.

A: amrubicin
****
Q: Expression and 1,4-dihydropyridine-binding properties of brain L-type calcium channel isoforms.

A:
calcium
****