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This invention provides a cobalamin derivative, its preparation method, and its application in the synthesis of arsenopyrine, relating to the field of heterocyclic compounds, and more specifically to the field of arsenopyrine synthesis technology. This cobalamin derivative is prepared by linking a 3-amino-3-carboxypropyl (ACP) group to the cobalt atom of cobalamin (CbI), and protecting the 3-amino-3-carboxypropyl group with a 9-fluorenemethoxycarbonyl (Fmoc) and a tert-butyl (tBu) group.

The application discloses a resistance detection device, a resistance detection system, an electric table and an electric hanging cabinet, belongs to the field of resistance detection, has high resistance detection sensitivity, and discloses the resistance detection device, which comprises a first shell and a second shell, the second shell is floatingly installed on the first shell through a first elastic element, a circuit board is arranged on the first shell, a resistance detection switch connected with the circuit board and a rotating knob are arranged on the first shell, one end of the rotating knob is a free end abutting against the first shell, the other end of the rotating knob is a pressing end for pressing the resistance detection switch, and the free end is driven to drive the pressing end to move away from the resistance detection switch to generate a resistance signal.