• British Pharmacopoeia Volume V
  • Appendices
  • Appendix I A. General Reagents

Tetramethylbenzidine
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Tetramethylbenzidine 3,3′,5,5′-Tetramethylbiphenyl-4,4′-diamine; C16H20N2 = 240.3 (54827-17-7)

General reagent grade of commerce.

Melting point, about 169°.