Human therapeutic compositions are provided, comprising compounds including a plurality of fused polycyclic moieties and a linker moiety. In certain embodiments, the compounds are the reaction products of aldehyde and harmaline components. The compositions exhibit anti-cancer properties, especially against lymphoma, leukemia, pancreatic, endometrial, ovarian, gastric, breast, renal, cervical, head and neck, and myeloma cell lines.