1-{[2-(4-Chlorophenyl)-4,4-dimethylcyclohex-1-en-1-yl]methyl}piperazine Dihydrochloride is an intermediate used in the preparation of Venetoclax (A112430), which is a potent and selective BCL-2 inhibitor with potent antitumour activity while sparing platelets. Venetoclax is used to treat chronic lymphocytic leukaemic cells and estrogen receptor-positive breast cancer.