prov:value
| - Of these, preferred are 1,4-thioxane-1,1-dioxide derivatives wherein each of R9 to R12 is a hydrogen atom, a methyl group, or an ethyl group, such as 1,4-thioxane-1,1-dioxide, 3-methyl-1,4-thioxane-1,1-dioxide, 3-ethyl-1,4-thioxane-1,1-dioxide, and 3,5-dimethyl-1,4-thioxane-1,1-dioxide.
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