2-Chloro-9-(1-methyl-4-piperidylidene)-thioxanthene 3973-51-1 4-(2-Chloro-9H-thioxanthen-9-ylidene)-1-methylpiperidine BRN 4147865 Lu 13-016 Piperidine, 4-(2-chloro-9H-thioxanthen-9-ylidene)-1-methyl-