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Convertible notes payable (Details)
Dec. 31, 2023
CNY (¥)
Dec. 31, 2022
USD ($)
Dec. 31, 2022
CNY (¥)
Convertible notes payable      
Liability component on initial recognition ¥ 7,264 $ 7,415  
Issuance of convertible notes 7,269    
Interest accrued 632   ¥ 360
Notes converted to ADS (4,202)   (517)
Repayment and balance adjustments (1,169)    
Exchange difference 217   6
Total ¥ 10,011,000   ¥ 7,264