In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called Acute toxicity and depressive effect on spontaneous motor activity of piperidine N-derivatives in mice, published in 1979-12-25, which mentions a compound: 3235-67-4, Name is 1-Piperidineacetic Acid, Molecular C7H13NO2, Product Details of 3235-67-4.
The acute toxicity and depressive effect on spontaneous motor activity of the title compounds I (R = CH2CO2H, CH2CH2OH, etc.) were examined using mice untreated and pretreated with phenobarbital and SKF-525A. The acute toxicity of I decreased and its depressive effect increased following enzyme induction, whereas following enzyme inhibition the opposite occurred. Structure-activity relations are discussed.
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Reference:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem