. 2022 Feb 23;12:821518. doi: 10.3389/fphar.2021.821518
Copyright © 2022 Li, Yu, Sun, Liu, Wang, Shao, Wang, Xie, Yao, Yao and Zhi.
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SCHEME 1.
Strategy for the synthesis of 2,3′-spirobi (indolin)-2′-ones.