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Commitments and contingencies
 12 Months Ended
Dec. 31, 2024
Commitments and Contingencies Disclosure [Abstract]  
Commitments and contingencies Commitments and contingencies
Purchase commitments
As of December 31, 2024, the Group has future minimum purchase commitment related to the purchase of research and development services. Total purchase obligations contracted but not yet reflected in the consolidated financial statements as of December 31, 2024 were as follows:
TotalLess than
one year		1-2 Years2-3 Years3-5 YearsOver 5
Years
RMBRMBRMBRMBRMBRMB
Purchase commitments166,421 159,754 6,667 — — — 
Capital commitments
Total capital expenditures contracted but not yet reflected in the consolidated financial statements as of December 31, 2024 were as follows:
TotalLess than
one year		1-2 Years2-3 Years3-5 YearsOver 5 Years
RMBRMBRMBRMBRMBRMB
Capital commitments45,305 45,305 — — — —