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Convertible notes payable (Details)
Dec. 31, 2022
CNY (¥)
Dec. 31, 2021
CNY (¥)
Dec. 31, 2021
USD ($)
Convertible notes payable      
Liability component on initial recognition ¥ 0   $ 7,415
Interest accrued 0 ¥ 360  
Notes converted to ADS 0 (517)  
Exchange difference 0 6  
Total ¥ 0 ¥ 7,264