Synthesis, DFT Study, and In Vitro Evaluation of Antioxidant Properties and Cytotoxic and Cytoprotective Effects of New Hydrazones on SH-SY5Y Neuroblastoma Cell Lines oleh Diana Tzankova, Hristina Kuteva, Emilio Mateev, Denitsa Stefanova, Alime Dzhemadan, Yordan Yordanov, Alexandrina Mateeva, Virginia Tzankova, Magdalena Kondeva-Burdina, Alexander Zlatkov, Maya Georgieva