3,6-bis(5-chloro-2-piperidyl)-2,5-piperazinedione, dihydrochloride, (3S-(3alpha(2S*,5R*),6alpha(2S*,5R*)))-isomer
3,6-bis(5-chloro-2-piperidyl)-2,5-piperazinedione, dihydrochloride, (3s-(3alpha(2s*,5r*),6alpha(2s*,5r*)))-isomer