Most of the compounds have physiologically active properties, and their biological properties are often attributed to the heteroatoms contained in their molecules, and most of these heteroatoms also appear in cyclic structures. A Journal, Article, Journal of Nutritional Science and Vitaminology called Action site of antagonists of vitamin B6 in the central nervous system of frogs and cockroaches, Author is Yamashita, Junko, which mentions a compound: 148-51-6, SMILESS is OC1=C(C)C(CO)=CN=C1C.[H]Cl, Molecular C8H12ClNO2, Name: 5-(hydroxymethyl)-2,4-dimethylpyridin-3-ol hydrochloride.
Treatment with thiosemicarbazide [79-19-6], semicarbazide-HCl [563-41-7], isoniazide [54-85-3], DL-penicillamine [52-66-4], or toxopyrimidine [73-67-6] induced wild leaping or jumping behavior, and tonic or clonic convulsions in the frog (Rana nigromaculata) in which the nervous parts posterior to the optic lobe inclusive remained intact. No convulsions were induced by castrix [535-89-7] or 4-deoxypyridoxine-HCl [148-51-6] in frogs in which the nervous parts anterior to the diencephalon inclusive had been removed. Excessive restlessness and convulsions were induced by thiosemicarbazide in cockroaches (Periplaneta americana) in which the central nerve cord was severed between the subesophageal and prothoracic ganglia.
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Reference:
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia