They were all amazing, really. Apomorphine Aporphine Bromocriptine Cabergoline Lisuride Memantine Nuciferine Pergolide Phenethylamine Piribedil Pramipexole Ropinirole Rotigotine Salvinorin A Also indirect D 2 agonists, such as dopamine reuptake inhibitors cocaine , methylphenidate , releasing agents amphetamine , methamphetamine , and precursors levodopa. N , N -Dimethylethylamine Trimethylamine.