Received 10 July 2010
aEnvironment and Plant Protection Institute, Chinese Academy of Tropical Agricultural Science, Danzhou 571737, People's Republic of China,bKey Laboratory of Marine Bio-resources Sustainable Utilization, South China Sea Institute of Oceanology, Chinese Academy of Sciences, 164 West Xingang Road, Guangzhou 510301, People's Republic of China, and cGovernment Degree College at Amadala Valasa, Srikakulam District, Andhra Pradesh, 532185, India
Correspondence e-mail: firstname.lastname@example.org, email@example.com
The title compound, C32H40O10, also known as xyloccensin L [systematic name: (1R,4aR,4bS,5aR,6aR,9R,10S,10aS,10bR,2aR,13R)-1-(furan-3-yl)-6a-hydroxy-10-(2-methoxy-2-oxoethyl)-9,10a,12a-trimethyl-3-oxododecahydro-1H,3H,5aH-6,9-methanoisochromeno[6,5-f]oxireno[g]chromen-13-yl (2E)-2-methylbut-2-enoate], is a limonoid with a C1-C29 oxygen bridge: this is the first report of the X-ray crystal structure of such a limonoid. Two fused pyran rings and two cyclohexane rings adopt boat conformations, while another cyclohexane ring and the d-lactone ring are in half-chair conformations. The molecular structure is stabilized by intramolecular O-HO hydrogen bonding.
The title compound was isolated from seeds of an Indian mangrove, Xylocarpus moluccensis, collected in the mangrove wetlands of the Godavari estuary, Andhra Pradesh. For previous investigations of the seeds of Xylocarpus granatum and X. moluccensis, see: Kubo et al. (1976); Ng et al. (1979); Alvi et al. (1991); Kokpol et al. (1996); Mulholland et al. (2000). For our group's work in this field, see: Wu et al. (2004a,b, 2005, 2008a,b).
Data collection: SMART (Bruker, 2004); cell refinement: SAINT-Plus (Bruker, 2004); data reduction: SAINT-Plus; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXL97 .
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: EZ2224 ).
Financial support of this work by the Important Project of Chinese Academy of Sciences (KSCX2-YW-R-093, KZCX2-YW-216), the National High Technology Research and Development Program of China (863 Program) (2007AA09Z407), the National Natural Science Foundation of China (20772135) and the Research Foundation for Young Talents from the South China Sea Institute of Oceanology, Chinese Academy of Sciences (M-YL SQ200802) is gratefully acknowledged.
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