Definition: Compounds of the general formula R:N.NR2, as resulting from the action of hydrazines with aldehydes or ketones. (Grant & Hackh's Chemical Dictionary, 5th ed)
CNI 1493 [ CNI-1493,N,N'-bis(3,5-diacetylphenyl)decanediamide tetrakis(amidinohydrazone) tetrahydrochloride,semapimod ] macrophage-deactivating agent used to treat experimental autoimmune encephalomyelitis in mice; a tetravalent guanylhydrazone; structure given in first source