1.NounThe polycyclic spiro compound derived from urea 1-(1-azabicyclo[2.2.2]octan-3-yl)-3-[3-(1H-indol-3-yl)-1-oxo-1-spiro[1,2-dihydroindene-3,4'-piperidine]-1'-ylpropan-2-yl]urea or any of a class of similar compounds having a piperidine ring attached in a spiro-manner