A hexachloro metabolite, dysidamide (2) has been isolated from a Red Sea sponge Dysidea herbacea. The structure of (2) has been established from spectroscopic and chemical evidence, and confirmed by an X-ray crystal structure determination. Crystals of (2) are orthorhombic P212121, a 20.509(13), b 18.411(11), c 11.356(9)?, Z 8. The structure was refined by least-squares methods to a residual of 0.049 for 2277 'observed' reflections. Two different conformations of the molecule are present in the crystal.
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Carmely et al. (1990) studied this question.
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