New massarilactones C (3) and D (4), massarigenin E (5), and coniothyrenol (6) were isolated from Coniothyrium sp. together with the known graphislactone A (1) and massarilactone A (2). The relative configuration of coniothyrenol (6) with an unprecedented benzo[a]xanthene skeleton and ten chirality centers was determined by 1D‐ and 2D‐NMR spectroscopy.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)
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Kock et al. (2007) studied this question.
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