title: A historical introduction to the chemistry of vitamin A and its analogs (retinoids).
mesh_terms: D000818:Animals; D006801:Humans; D008099:Liver / Q000378:metabolism; D012172:Retinaldehyde; D013329:Structure-Activity Relationship; D014212:Tretinoin; D014801:Vitamin A / Q000031:analogs & derivatives* / Q000138:chemical synthesis
chemical_list: D014801:Vitamin A; D014212:Tretinoin; D012172:Retinaldehyde