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Methyl 5,7-dihydr-oxy-2,2,9-trimethyl-6,11-dioxo-6,11-dihydro-2H-anthra[2,3-b]pyran-8-carboxyl-ate.


ABSTRACT: The title compound, C(22)H(18)O(7), also known as laurentiquinone B, is a new anthraquinone which was isolated from Vismia laurentii, a Cameroonian medicinal plant. The asymmetric unit contains two independent mol-ecules. Each of them contains four fused rings, three of which are coplanar and typical of anthracene, while the heterocyclic rings adopt envelope conformations. Intra-molecular O-H?O hydrogen bonds result in the formation of two planar rings, which are also almost coplanar with the adjacent rings. In the crystal structure, inter-molecular O-H?O and C-H?O hydrogen bonds link the mol-ecules and a ?-? contact is also present [centroid-centroid distance = 3.967?(3)?Å].

SUBMITTER: Noungoue Tchamo D 

PROVIDER: S-EPMC2960081 | BioStudies | 2008-01-01T00:00:00Z

REPOSITORIES: biostudies

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