The in vitro toxicity of two amidrazones I [N(1)-(3-benzyloxy-4-methoxybenzylidene)-pyridine-2-carboxamidrazone] and II [N(1)-(4-benzyloxy-3-methoxybenzylidene)-pyridine-2-carboxamidrazone] and their precursors PI (3-benzyloxy-4-methoxybenzaldehyde) and PII (4-benzyloxy-3-methoxybenzaldehyde) was