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The carbon marked with the asterisk cannot change its configuration, for it to be counted as a stereocentre, it must be able to. hence 2 isomers only


I have belatedly come across this inquiry by Charles (unseen by ChemSE in 3 years) and answered by @ron. If Ron's interpretion of what Charles intended is correct, then I presume that the hexaol (arbitrary numbering) shown below would fit into the conversation. If not, my apologies. The central carbon $\ce{C2}$ bears, in addition to hydrogen, three groups ...

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