Lycobetaine acts as a selective topoisomerase II beta poison and inhibits the growth of human tumour cells. - Barthelmes,H.U.; Niederberger,E.; Roth,T.; Schulte,K.; Tang,W.C.; Boege,F.; Fiebig,H.H.; Eisenbrand,G.; Marko,D. (Br J Cancer, 2001)