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In the title compound, C15H25NO2, all three six-membered rings adopt chair conformations. The cyclo­hexane and piperidine rings within the perhydro­isoquinoline are transtrans fused. The N atom has a trigonal–pyramidal geometry (the sum of the bond angles is 328.0°). The methyl substituent occupies the sterically preferrable equatorial position. In the crystal, mol­ecules form infinite [100] chains via O—H...N hydrogen bonds.

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The title compound, C16H12NOSSe+·HSO4, was obtained from a mixture of 3-(4-meth­oxy­phen­yl)[1,3]selenazolo[2,3-b][1,3]benzo­thia­zol-4-ium chloride and potassium hydrogen sulfate. In the cation, the benzene ring is twisted by 71.62 (7)° from the tricycle mean plane. In the crystal, O—H...O hydrogen bonds link the anions into chains along [100]. The anions in adjacent chains are linked via weak C—H...O hydrogen bonds. The crystal packing exhibits short inter­molecular contacts between the chalcogen unit and the O atoms: Se...O(anion) 2.713 (3), Se...O(cation) 2.987 (3) and S...O(anion) 2.958 (3) Å.
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