Isolation of Ciliatamide D from a Marine Sponge Stelletta sp. and a Reinvestigation of the Configuration of Ciliatamide A
- Yasufumi Imae ,
- Kentaro Takada ,
- Shigeru Okada ,
- Yuji Ise ,
- Hiroshi Yoshimura ,
- Yasuhiro Morii , and
- Shigeki Matsunaga
Abstract

A new lipopeptide, ciliatamide D (1), was isolated from a marine sponge Stelletta sp., collected at Oshimashinsone, together with the known compound ciliatamide A (2). Ciliatamide D (1) is a congener of 2, in which N-Me-Phe is replaced by N-Me-Met(O). Marfey’s analysis of the acid hydrolysate of 1 demonstrated that the two constituent amino acids were both in the l-form. This result prompted us to carefully investigate the configuration of 2, resulting in the assignment of the l-form for both residues.
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