Spiro(piperidine-4,7'-(7H)thieno(2,3-C)pyran)-1-propanamide, 2'-fluoro-alpha-((2-fluorophenyl)methyl)-4',5'-dihydro-N-methyl-, (alphaS)-
NOP-1A is under investigation in clinical trial NCT01198197 (PET Brain and Whole Body Distribution Studies for Nociceptin/Orphanin FQ Peptide (NOP) Receptor Using [11C]NOP-1A).