Isolation and Structure of Cephalostatins 10 and 11

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Abstract
Further investigation of antineoplastic constituents from the marine worm Cephalodiscus gilchristi, employing a 450 kg re-collection from the Indian Ocean (Southeast Africa), has led to isolation and structural determination of two previously undetected members of the cephalostatin series, designated cephalostatins 10 [4] and 11 [5]. Structural analyses were conducted primarily employing high field 2D nmr and high resolution mass spectral techniques. All the stereochemical assignments were deduced using the original X-ray crystal structure of cephalostatin 1 and ROESY 2D nmr methods. Both cephalostatins 10 and 11 strongly inhibited growth of a series of important human cancer cell lines.

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