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enter image description here (1S,3S,4S,5S)-3,5-dimethoxy-1-phenylcyclohexane-1,4-dithiol.

ChemDraw21 shows the C4 is S configuration. However I think C4 has two same function groups(C3 and C5 are both S configuration; C2-1-6 and C6-1-2 are also the same).

So why C4 is chiral? where did I go a mistake?

HasturQ
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