Dissolve the benzo-15-crown-5 derivative in a suitable solvent. Add the nickel(II) salt to form the nickel(II) complex. Isolate the complex through precipitation or extraction.
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Ni((C5H10N)C(S)NC(O)C6H5)2
12-(4-Nitrobenzyl)-1,4,7,10-tetraazacyclotridecane-11,13-dione
