In organic chemistry, atoms other than carbon and hydrogen are generally referred to as heteroatoms. The most common heteroatoms are nitrogen, oxygen and sulfur. Now I present to you an article called Configuration of the camphoric acids, published in 1900, which mentions a compound: 560-09-8, mainly applied to , Recommanded Product: 560-09-8.
The molecule of camphoric acid contains two, and only two, asymmetric carbon atoms, that these carbon atoms are links in a closed carbon chain, and that each of them has a carboxyl group attached to it. It is further known that the asymmetric carbon atoms are not similar to each other, so that there can be no optical inactivity by internal compensation. To distinguish between these two asymmetric atoms, the prefixes ortho- and allo-, which are commonly used in application to the two carboxyl groups are employed. A discussion on the asymmetric carbon atom to which the ortho-carboxyl group is attached as the ortho-carbon atom, and of that to which the allo-carboxyl group is united as the allo-carbon atom, is presented.
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Reference:
Isothiazole – Wikipedia,
Isothiazole – ScienceDirect.com