1,1-Bis(aminomethyl)cyclohexane condenses with formaldehyde to precipitate a polymer, which upon heating is readily isomerized to the nonacyclic compound tetraspiro[tetrakis(cyclohexane)-1,5⠲⠲⠲⠲:1â ² ,11⠲⠲⠲⠲:1â ³, 17⠲⠲⠲⠲:1⠲⠲⠲,23⠲⠲ ⠲⠲-[1,3,7,9,13,15,19,21]octaazapentacyclo[19.3.1.1^3,7.1^9,13. 1^15,19]octacosane 1, whose structure has been determined by X-ray analysis and ¹³C NMR spectroscopy.