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Market risk (Details) - CNY (¥)
Dec. 31, 2022
Dec. 31, 2021
Statement [Line Items]    
Convertible notes payable ¥ 7,264,000 ¥ 0
Loan Receivables 753,043,000 754,393,000
Market risk [member]    
Statement [Line Items]    
Loan Receivables 556,112,000 555,133,000
Loan Payable ¥ 161,439 ¥ 161,569,000