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Be careful here,,,,,,Fischer projections are always tricky....... If you get a Fischer, cut it in half horizontally. If the groups do not exactly match each other, it is NOT a meso compound . Even though this molecule is R at the OH carbon and S at the SH carbon, it is optically active and would not be a meso compound. This molecule would have 4 stereoisomers ,,,,,namely RS SR RR and SS. BTW......Just because a molecule has an element of symmetry does not imply it must be a meso compound.
