Synonyms: 1,4,8,12-Tetraazacyclopentadeca-4,7,12,15-tetraene,ethanone deriv., nickel complex;1,4,8,12-Tetraazacyclopentadecane, nickel deriv.; Ethanone,1,1'-(2,2,7,13-tetramethyl-1,4,8,12-tetraazacyclopentadeca-4,7,12,15-tetraene-6,14-diyl)bis-, nickel complex; NSC 175450