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Common stock and convertible preferred stock (Tables)
9 Months Ended
Sep. 30, 2021
Common stock and convertible preferred stock  
Schedule of warrants outstanding

At September 30, 2021 common stock warrants outstanding were as follows:

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Warrants

    

Exercise Price per Share

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Expiration Date

814,223

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$ 9.00

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June 2, 2023

500,000

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$ 45.00

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April 28, 2024