There is no information about biological nor medical application of ferrous selenide (also known as iron selenide). But is used in electrical semiconductors.

Piperidine is a normal constituent in mammalian brain. It was shown to affect synaptic mechanism in the CNS, and influence neural mechanisms governing regulation of emotional behavior, sleeping, and extrapyramidal function. In addition, there are enzyme systems within the brain that synthesize and metabolize piperidine, and uptake and storage mechanisms for piperidine are found in the nerve endings. Piperidine, which proved to be a highly effective “antipsychotomimetic” agent in rats, has been reported to bring about substantial improvement in a variety of schizophrenic patients.

Nickel nitrate is the inorganic compound Ni(NO3)2. The most common form of nickel nitrate is hexahydrate. It is irritating to the eyes, skin and, upon inhalation of the dust, respiratory tract. It may cause skin allergy. Along with most other nickel compounds, nickel nitrate is a carcinogen. Nickel(II) nitrate hexahydrate is widely used in the production of nickel catalysts, by impregnating an inert carrier and decomposing the nitrate.

There is no information about biological and pharmacological application of lead stearate. But is known, that this is a toxic substance which can accumulate inside organism, because it can be absorbed through the skin.