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The chemical structures of the dopamine receptor agonists Ropinirole (A), which has an affinity for D2R, D3R, and D4R, Bromocriptine (B), also non-selective with an affinity for D2R, D3R, and D4R, and Sumanirole (C), selective for D2R. (D) Chemical structure of Dexpramipexole (its neuroprotective effects are attributed to dopaminergic-independent activities).
