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 Study on the structure and composition of anodic oxide films of aluminum, published in 1997-11-30, which mentions a compound: 17927-65-0, Name is Aluminum(III) sulfate xhydrate, Molecular Al2H8O13S3, Formula: Al2H8O13S3.
The structure and composition of the porous anodic oxide films of Al (abbreviated AOFAl) formed in oxalic acid (I) and H2SO4 (II) solutions, resp., were studied by TEM, IR and TGA. The porous anodic oxide films consist of a large number of hexagonal cells with an irregularly round pore in the center of each cell which penetrates vertically from surface to bottom, while a barrier layer under the film directly contacts with an Al substrate in a scallop shape. The content of Al2(C2O4)3 and Al2(SO4)3 in AOFAl (I) and (II) are ∼4.9% and ∼14.2%, resp.; ∼3.5% H2O of crystallization of Al2(SO4)3.xH2O which can be evolved at rather low temperature (∼85°) enriches between the cells and under the barrier layer of AOFAl (II); after irradiation by the electron beam of TEM the H2O of crystallization is removed and voids are formed.
In addition to the literature in the link below, there is a lot of literature about this compound(Aluminum(III) sulfate xhydrate)Formula: Al2H8O13S3, illustrating the importance and wide applicability of this compound(17927-65-0).
Reference:
Isothiazole – Wikipedia,
Isothiazole – ScienceDirect.com