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Kahalalide derivatives from the Indian sacoglossan mollusk Elysia grandifolia

Ashour, Mohamed and Edrada, RuAngelie and Ebel, Rainer and Wray, Victor and Wätjen, Wim and Padmakumar, K and Müller, Werner E G and Lin, Wen Han and Proksch, Peter and Edrada-Ebel, Ruangelie (2006) Kahalalide derivatives from the Indian sacoglossan mollusk Elysia grandifolia. Journal of Natural Products, 69 (11). pp. 1547-1553. ISSN 0163-3864

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Abstract

Two new cyclic depsipeptide derivatives, kahalalides R (1) and S (2), together with two known congeners, kahalalides F (3) and D (4), were isolated from the Indian sacoglossan mollusk Elysia grandifolia. The structures of the new compounds were unambiguously established on the basis of NMR spectroscopic (1H, 13C, COSY, HMBC) and mass spectrometric (FABMS, ESIMS, MALDI-TOF/PSD) data, which also included Marfey amino acid analyses. The new derivative kahalalide R was found to exert comparable or even higher cytotoxicity than the potential drug candidate kahalalide F toward the MCF7 human mammary carcinoma cell line.