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Kamebacetal A (1) is an ent-kaurane diterpenoid isolated from Isodon racemosa (Hemsl) Hara. This natural product exhibits significant cytotoxicity against human Bel-7402 and HO-8910 tumor cells. The geometrical conformation of 1 has been optimized at the B3LYP/6-311+G(d) level of theory. The results indicated that the calculated geometric parameters are close to the X-ray crystal structure. The theoretical...
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