Notes. Isolation and crystal structure of the trans isomer of (6,7,13,14,15,16,17,18,24,25,31,32,33,34,35,36-hexadecahydrotetrabenzo[e,m,s,a][1,14,15,18,8,11,22,25]tetraoxatetra-azacyclo-octacosine)di-isothiocyanatonickel(II)