3-Hydroxymorphinan
The dextrorotatory stereoisomer of the compound is an active metabolite of dextromethorphan , dextrorphan , and 3-methoxymorphinan , and similarly to them has potent neuroprotective and neurotrophic effects on LTS- and MPTP-treated dopaminergic neurons of the nigrostriatal pathway , but notably without producing any neuropsychotoxic side effects ( e . g . , dissociation or hallucinations ) or having any anticonvulsant actions . 
<triplet> MPTP <subj> dopaminergic <obj> subject has role