Ni acetate is a water soluble salt of Ni, which leads to skin irritation, in particular to allergic contact dermatitis. May cause cancer according to animal studies. Symptoms of overexposure to nickel can cause sensitization, dermatitis, allergic asthma and pneumonitis.

XK-469 (NSC 697887) is a synthetic quinoxaline phenoxypropionic acid derivative that possesses unusual solid tumor selectivity and activity against multidrug-resistant cancer cells. XK469 acts as a selective topoisomerase IIβ inhibitor. Other proposed mechanisms include XK469-induced inhibition of cyclin B1 ubiquitination and apoptosis via binding of the peripheral benzodiazepine receptor. A phase I study was performed to determine the safety and pharmacokinetics of XK469R in patients with various neoplasms.