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Draw a substituted saturated or monounsaturated six-membered ring (cyclohexane,
cyclohexene, piperidine, etc.), do a 3D minimization (Structure → Clean 3D
→ Clean in 3D), and flip the chair or half-chair. (If you get this message
repeatedly, the compound you drew lacks a saturated or monounsaturated six-membered ring.)
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