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.

RDH12, a retinol dehydrogenase causing Leber's congenital amaurosis, is also involved in steroid metabolism.
retinol

Multifunctional targets of dietary polyphenols in disease: a case for the chemokine network and energy metabolism.
polyphenols

Intrauterine pressure, ischemia markers, and experienced pain during administration of a vasopressin V1a receptor antagonist in spontaneous and vasopressin-induced dysmenorrhea.

vasopressin