which are typical chemical shifts of an isocyano carbon and a carbon attached to an isocyano nitrogen). The planar structure of 1 was readily determined by comparison
of the COSY, HMQC, and HMBC spectra with those of 2. NOESY correlations; H-5/H-6 and H-5/H-7
implied a-orientation for C-5, H-6, and H-7 in the cyclohexane.