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The title compound, C 12 H 20 N 4 O, undergoes a phase transition on cooling. The room-temperature structure is tetra­gonal ( P 4 3 2 1 2,  Z ′ = 1), with the meth­oxy­bornyl group being extremely disordered. Below 213 K the structure is ortho­rhom­bic ( P 2 1 2 1 2 1 ,  Z ′ = 2), with ordered mol­ecules. The two independent mol­ecules ( A  and  B ) have very similar conformations; significant differences only occur for the torsion angles about the C born­yl —C tetra­zole  bonds. The independent mol­ecules are approximately related by the pseudo-symmetry relation:  x B   = −1/4 +  y A  ,  y B   = 3/4 -  x A   and  z B   = 1/4 +  z A  . In the crystal, mol­ecules are connected by N—H⋯N hydrogen bonds between the tetra­zole groups, forming a pseudo-4 3  helix parallel to the  c -axis direction. The crystal studied was a merohedral twin with a refined twin fraction value of 0.231 (2).

5-[(1R,2R,4R)-2-Methoxy-1,7,7-trimethylbicyclo[2.2.1]hept-2-yl]-1H-tetrazole