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.

The (R)-omeprazole hydroxylation index reflects CYP2C19 activity in healthy Japanese volunteers.
(R)-omeprazole

Identification of a primary target of thalidomide teratogenicity.
thalidomide

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

retinol

