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181826-52-8

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181826-52-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 181826-52-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,1,8,2 and 6 respectively; the second part has 2 digits, 5 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 181826-52:
(8*1)+(7*8)+(6*1)+(5*8)+(4*2)+(3*6)+(2*5)+(1*2)=148
148 % 10 = 8
So 181826-52-8 is a valid CAS Registry Number.

181826-52-8Downstream Products

181826-52-8Relevant articles and documents

Total synthesis of the large non-ribosomal peptide polytheonamide B

Inoue, Masayuki,Shinohara, Naoki,Tanabe, Shintaro,Takahashi, Tomoaki,Okura, Ken,Itoh, Hiroaki,Mizoguchi, Yuki,Iida, Maiko,Lee, Nayoung,Matsuoka, Shigeru

supporting information; scheme or table, p. 280 - 285 (2010/09/03)

Polytheonamide B is by far the largest non-ribosomal peptide known at present, and displays extraordinary cytotoxicity (EC50 =68 pg ml -1 , mouse leukaemia P388 cells). Its 48 amino-acid residues include a variety of non-proteinogenic d- and l-amino acids, and the absolute stereochemistry of these amino acids alternate in sequence. These structural features induce the formation of a stable β-strand-type structure, giving rise to an overall tubular structure over 30A? in length. In a biological setting, this fold is believed to transport cations across the lipid bilayer through a pore, thereby acting as an ion channel. Here, we report the first chemical construction of polytheonamide B. Our synthesis relies on the combination of four key stages: syntheses of non-proteinogenic amino acids, a solid-phase assembly of four fragments of polytheonamide B, silver-mediated connection of the fragments and, finally, global deprotection. The synthetic material now available will allow studies of the relationships between its conformational properties, channel functions and cytotoxicity.

The asymmetric synthesis of allylglycine and other unnatural α-amino acid via zinc-mediated allylation of oximes in aqueous media

Hanessian, Stephen,Yang, Rui-Yang

, p. 5273 - 5276 (2007/10/03)

Enantiomerically pure or highly enriched allylglycine and its chain-substituted analogs are easily accessible from the reaction of the sultam derivative of O-benzyl glyoxylic acid oxime with allylic bromides in the presence of powdered zinc in aqueous ammonium chloride.

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