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.

Example Input: Expression and 1,4-dihydropyridine-binding properties of brain L-type calcium channel isoforms.
Example Output: calcium

Example Input: Sulfasalazine, a potent suppressor of lymphoma growth by inhibition of the x(c)- cystine transporter: a new action for an old drug.
Example Output: cystine

Example Input: Sulfonylureas and glinides exhibit peroxisome proliferator-activated receptor gamma activity: a combined virtual screening and biological assay approach.
Example Output:
glinides