(S)-1-(1'-(4-Chloro-2-methoxyphenyl)-5'-fluoro-1',9'-dihydrospiro[cyclopropane-1,4'-pyrido[3,4-b]indol]-2'(3'H)-yl)ethan-1-one
ONO-2952 is under investigation in clinical trial NCT01887002 (Study to Evaluate the Effects of ONO-2952 on Pain Perception Produced by Rectal Distention in Female Subjects With Diarrhea-Predominant Irritable Bowel Syndrome (IBS-D)).