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The first de novo synthetic pathway to the exceptionally rare C5-nor stemmadenine natural product, conolidine, and the first asymmetric synthesis of any member of this natural product class arc described. C5-nor stemmadenine compositions are also described. These compounds, for example, (+/- )-, (+)- and (-)-conolidine are potent and efficacious non-opioid analgesics in tonic and persistent pain.