instruction:
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.
question:
Vitamin E deficiency impairs the somatostatinergic receptor-effector system and leads to phosphotyrosine phosphatase overactivation and cell death in the rat hippocampus.
answer:
phosphotyrosine


question:
Effects of pentosan polysulfate sodium on the estrogen-induced pituitary prolactinoma in Fischer 344 rats.
answer:
sodium


question:
Rapid quantitation of plasma 2'-deoxyuridine by high-performance liquid chromatography/atmospheric pressure chemical ionization mass spectrometry and its application to pharmacodynamic studies in cancer patients.
answer:

2'-deoxyuridine