Hemi-phorboxazole A, a minor truncated analogue of phorboxazole A from the marine sponge Phorbas sp., was isolated in a total yield of 16.5 microg (28 nmol). The structure was elucidated by application of integrated nanomole-scale natural product techniques, including cryomicroprobe NMR, (1)H-coupled HSQC, and circular dichroism (CD).
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Dalisay et al. (2009) studied this question.
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