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∑ (b + c  a) x (c^2y^2  b^2z^2) = 0 

X(1), X(8), X(40), X(56), X(84), X(2122), X(2123) vertices of the extouch triangle infinite points of K691 M1, M2 on the line X4)X(9) their isogonal conjugates N1, N2 on the line X(1)X(6) 

See explanations in the page K691. K692 = pK(X6, X8) is tangent at A, B, C to the cevian lines of X(56) and the polar conic of X(56) is the circumconic through X(8), X(56). The isotomic transform of K692 is pK(X76, X3596). 
