It's not a widely used term in chemistry, but it may refer to compounds that have a similar chemical structure or properties, potentially differing in some subtle way (e.g., stereochemistry or substituent groups). In the context of this article, it likely refers to related compounds that are being compared or studied for their different properties or behaviors.
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4,4'-di({3-[(2,2-diphenylhydrazine-1-ylidene)methyl]carbazole-9-yl}-2-hydroxypropylsulfanyl)diphenylsulfane
