chemical neurotransmitter nucleoside adenosine 9-B-D-ribofuranosyl-9H-purin-6-amine A nucleoside that is composed of adenine and d-ribose. Adenosine or adenosine derivatives play many important biological roles in addition to being components of DNA and RNA. Adenosine itself is a neurotransmitter. Adenine riboside Adenosine IMR:0100126 IMR:0200246 KEGG:C00212 Ribofuranosyladenine molecule_role