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Two polymorphic crystals (α and β) of 4-hydroxy-1-methylpiperidine betaine hydrochloride, HO-MPBH + ·Cl − , have been synthesized and their structures solved by the X-ray diffraction methods. The piperidine ring adopts the chair conformation and the hydroxy group at C(4) in the α-polymorph is in the axial position, while in the β-polymorph it is in the equatorial one. The CH 2...
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