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Accrued expenses (Details) - USD ($)
Jun. 30, 2024
Dec. 31, 2023
Accrued expenses    
Professional fees $ 209,372 $ 138,601
Compensation, severance and benefits 582,437 1,016,960
Research and development 1,240,751 856,575
Other 46,603 174,126
Total accrued expenses $ 2,079,163 $ 2,186,262