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Other current assets - Additional information (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 CNY (¥) | Dec. 31, 2023 CNY (¥) | Dec. 31, 2024 USD ($)
Other current assets |  |  |
Impairment of inventory | ¥ 0 | ¥ 240,000 |
Inventory gross amount | 10,674,018 | 10,383,964 | $ 1,462,334
Valuation allowance of inventory | 9,179,453 |  |
Receivables from individuals | ¥ 46,000,000 | ¥ 76,000,000 |
Minimum |  |  |
Other current assets |  |  |
Interest rates | 0.00% |  |
Maximum |  |  |
Other current assets |  |  |
Interest rates | 5.50% |  |

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