Name: dimethylglyoxime; diacetyl dioxime; Chugaev's reagent
* IUPAC
CAS Number: 95-45-4
Chemical Formula: C₄H₈N₂O₂ or CH₃C(NOH)C(NOH)CH₃
Molar Mass: 116.11852 g
Mass Percent: C 41.373 %; H 6.9442 %; N 24.124 %; O 27.557 % 

• organic

• "Detection and determination of Ni and its separation fro Co and many other metals. Forms a scarlet red ppt [precipitate] with Ni even in dil[ute] sol[utio]ns. Separation of Pd from Sn, Au, Rh, and Ir, also to detect Bi with which it forms a bright yellow color ppt." 1

• "A well known reagent in analytical chemistry..." 2

Ni(NO3)2 (aq) + 2 C4H8N2O2 (s) → Ni(C4H7N2O2)2 (s) + 2 HNO3 (aq) 3

Wikipedia

(1) - The Merck Index: An Encyclopedia of Chemicals, Drugs, and Biologicals, 13th ed.; Budavari, S.; O'Neil, M.J.; Smith, A.; Heckelman, P. E.; Kinneary, J. F., Eds.; Merck & Co.: Whitehouse Station, NJ, 2001; entry 3272.
(2) - Kotz, John C. and Purcell, Keith F. Chemlstry and Chemlcal Reactivity, 2nd ed.; CBS College Publishing: New York. NY, 1987; p 98.
(3) - Kotz, John C., Treichel, Paul, and Weaver, Gabriela. Chemistry & Chemical Reactivity 6th ed.; Thomson Brooks/Cole: Belmont, CA, 2006; p 161.