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 Aryl ethers of 4-[(2-hydroxyethyl)sulfanyl]pyrimidine derivatives: Pathways of synthesis and fungicidal activity of their salt forms, published in 2016-06-30, which mentions a compound: 6307-44-4, Name is 2-Amino-6-methylpyrimidine-4-thiol, Molecular C5H7N3S, Name: 2-Amino-6-methylpyrimidine-4-thiol.
2-Amino-4-[(2-aryloxyethyl)sulfanyl]-6-methylpyrimidines were obtained by S-alkylation of 2-amino-6-methylpyrimidin-4(3H)-thione with 2-aryloxyethyl chlorides. Since 2-amino-4-[(2-chloroethyl)sulfanyl]-6-methylpyrimidine is prone to in situ intramol. cyclization it cannot be used in Claisen reaction. The bromination of the target compounds provided 5-bromo derivatives; some of their hydrochlorides exhibited fungicidal activity.
From this literature《Aryl ethers of 4-[(2-hydroxyethyl)sulfanyl]pyrimidine derivatives: Pathways of synthesis and fungicidal activity of their salt forms》,we know some information about this compound(6307-44-4)Name: 2-Amino-6-methylpyrimidine-4-thiol, but this is not all information, there are many literatures related to this compound(6307-44-4).
Reference:
Isothiazole – Wikipedia,
Isothiazole – ScienceDirect.com