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Cai, D., Zhang, Z., Meng, Y., Zhu, K., Chen, L., Yu, C., … Gong, Y. (2020). Efficient synthesis of piperazinyl amides of 18β-glycyrrhetinic acid. Beilstein Journal of Organic Chemistry, 16, 798–808. doi:10.3762/bjoc.16.73 
10.3762/bjoc.16.73
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