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Liu, G.-S., Dong, Q.-L., Yao, Y.-S., & Yao, Z.-J. (2008). Expeditious Total Syntheses of Camptothecin and 10-Hydroxycamptothecin. Organic Letters, 10(23), 5393–5396. doi:10.1021/ol802250y 
10.1021/ol802250y