1,3-dihydrospiro[indole-2,3'-piperidine] InChI=1/C12H16N2/c1-2-5-11-10(4-1)8-12(14-11)6-3-7-13-9-12/h1-2,4-5,13-14H,3,6-9H spiro[2H-indole-2,3'-piperidine], 1,3-dihydro-