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.

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

Output: cystine


Input: Consider Input: Jostling for position: optimizing linker location in the design of estrogen receptor-targeting PROTACs.

Output: estrogen


Input: Consider Input: Nocapyrones H-J, 3,6-Disubstituted α-Pyrones from the Marine Actinomycete Nocardiopsis sp. KMF-001.


Output: 3,6-Disubstituted α-Pyrones