module.exports = [
    { action: '\\sqrt', label: '\\sqrt{X}' },
    { action: '^', label: 'x^{X}' },
    { action: '\\frac', label: '\\frac{X}{X}' },
    { action: '\\int', label: '\\int_{X}^{X}' },
    { action: '\\lim_', label: '\\lim_{X}' },
    { action: '\\overrightarrow', label: '\\overrightarrow{X}' },
    { action: '_', label: 'x_X' },
    { action: '\\nthroot', label: '\\sqrt[X]{X}' },
    { action: '\\sum', label: '\\sum_{X}^{X}' },
    { action: '\\binom', label: '\\binom{X}{X}' },
    { action: '\\sin' },
    { action: '\\cos' },
    { action: '\\tan' },
    { action: '\\arcsin' },
    { action: '\\arccos' },
    { action: '\\arctan' },
    { action: '\\not' },
    { action: '\\vec', label: '\\vec{X}' },
    { action: '\\bar', label: '\\bar{X}' },
    { action: '\\underline', label: '\\underline{X}' },
    { action: '\\overleftarrow', label: '\\overleftarrow{X}' },
    { action: '|', label: '|X|'},
    { action: '(', label: '(X)'}
]

@@ -655,33 +655,8 @@
  %7D,%0A
-    %7B action: '%5C%5Cnot' %7D,%0A
     

Remove problematic not tool from the equation toolbar;