Simple see this screenshot from uk wikipedia. This is hidden in german wikipedia, cause it could give bad emotions from both world wars, where mustard gas was used to kill millions. But here in original you will see it, simply fact that chemotherapy is a mustard gas derivate. One that you will get into your blood by free choice, the nurse will wear one inch protecting gloves and the doctors stays out of range for security reasons. Taste mustard gas, maybe for the last time.