Two new clerodane diterpenes 4 and 3, along with four known constituents, including neocleroda- 3,13-diene-15,16-olide-18-oic acid (1), stictic acid (2), hautriwaic acid (5), and 15,16-epoxy-19- hydroxy-1,3,13(16),14-clerodatetraen-18-oic acid (6), were isolated from stems and leaves of Dodonaea viscosa. Their structures were elucidated by spectroscopic methods, including one- and twodimensional NMR experiments (COSY, HMBC, HMQC, and ROESY)
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Huang et al. (2010) studied this question.
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