Synthesis of podophyllotoxin linked β-carboline congeners as potential anticancer agents and DNA topoisomerase II inhibitors - Sathish, M; Kavitha, B; Nayak, V L; Tangella, Y; Ajitha, A; Nekkanti, S; Alarifi, A; Shankaraiah, N; Nagesh, N; Kamal, A (Eur J Med Chem, 2018)