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Further studies on the bark of Taiwania cryptomerioides found four new podocarpane derivatives, 1β,13-dihydroxy-8,11,13-podocarpatriene (1), 14,18-dihydroxy-13-methoxy-8,11,13-podocarpatriene (2), 1β,14-dihydroxy-13-methoxy-8,11,13-podocarpatriene-2,7-dione (3), and 3β,14-dihydroxy-13-methoxy-8,11,13-podocarpatrien-7-one (4), together with a known 1β,13,14-trihydroxy-8,11,13-podocarpatrien-7-one (5). Those structures were elucidated principally from spectral evidence.
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Kuo et al. (2002) studied this question.
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