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Bridged Lactams in Total Synthesis of Amaryllidaceae Alkaloids: a) Oxohaemanthidine, Oxodihydrohaemanthidine, Oxoapohaemanthidine and Pretazzetine; b) Dihydrocrinine; c) 6,11-Dioxocrinene; d) Haemanthidine (please use double-column format for Scheme 183)
