1-cyclohepta-2,4,6-trien-1-ylidene-N,N,N',N'-tetramethylmethanediamine InChI=1/C12H18N2/c1-13(2)12(14(3)4)11-9-7-5-6-8-10-11/h5-10H,1-4H methanediamine, 1-(2,4,6-cycloheptatrien-1-ylidene)-N,N,N',N'-tetramethyl-