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 The preparation of additive PDX used in shampoo creams, published in 1990-06-30, which mentions a compound: 2402-95-1, Name is 2-Chloropyridine 1-oxide, Molecular C5H4ClNO, Recommanded Product: 2402-95-1.
The synthesis of Zn salt of 1-hydroxy-2-pyridinethione (I; PDX) was described. The typical phys. properties and clin. antipruritic, dandruff-resistant and alopecia-treating effects of I contained in shampoo creams were studied.
In some applications, this compound(2402-95-1)Recommanded Product: 2402-95-1 is unique.If you want to know more details about this compound, you can contact with the author or consult more relevant literature.
Reference:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem