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The title compound, C17H18NO+·I-, is an adduct resulting from an intra­molecular Diels-Alder reaction of methallyl chloride with 3,4-dihydro-1-furylisoquinoline. The cation comprises a fused penta­cyclic system containing three five-membered rings (dihydro­pyrrole, dihydro­furan and tetra­hydro­furan) and two six-membered rings (tetra­hydro­pyridine and benzene). The five-membered rings have the usual envelope conformations, and the central six-membered tetra­hydro­pyridine ring adopts the unsymmetrical half-boat conformation. In the crystal, cations and iodide anions are bound by weak inter­molecular hydrogen-bonding inter­actions into a three-dimensional framework.
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