The less soluble isomer of 1,2,3,3a,4,5,6,6a,7,8,9,9a-dodecahydro-2,5,8-trimethyl-1,4,7,96-tetra-azaphenalene has trans-fused rings in chair forms with all methyl groups in equatorial positions. The more soluble isomer has one methyl group in an axial position.
K. G. R. Pachler and J. R. Parrish, J. Chem. Soc. B, 1968, 760 DOI: 10.1039/J29680000760
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