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253790-49-7

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253790-49-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 253790-49-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,5,3,7,9 and 0 respectively; the second part has 2 digits, 4 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 253790-49:
(8*2)+(7*5)+(6*3)+(5*7)+(4*9)+(3*0)+(2*4)+(1*9)=157
157 % 10 = 7
So 253790-49-7 is a valid CAS Registry Number.

253790-49-7Downstream Products

253790-49-7Relevant articles and documents

Oligomers of β2- and of β3-homoproline: What are the secondary structures of β-peptides lacking H-bonds?

Abele, Stefan,Voegtli, Kurt,Seebach, Dieter

, p. 1539 - 1558 (2007/10/03)

To study the role of H-bonds in stabilizing β-peptidic secondary structures, we have synthesized β-oligopeptides (up to the octadecamer 12) consisting of β2- and β3-homoproline, i.e., β-peptides lacking amide protons. The enantiomer purity of the building block β2-homoproline (nipecotic acid, 4) was determined by HPLC analysis of the N-(2,4- dinitrophenyl) derivative 5 on a Chiralcel-OD column (cf. Fig. 2). The CD spectra of the all-(S)-β2- and all-(S)-β3-HPro-containing, β-peptides display novel and intensive CD patterns which may be indicative of a secondary structure (cf. Fig. 3). It is noteworthy that a distinct CD pattern was observed with the β3-HPro derivatives containing as few as three residues (7a). The crystal structure of a N-deprotected β3-HPro-tripeptide 7c is presented (cf. Figs. 4 and 5), and a model for the structure of β- peptides consisting of β3-HPro is discussed (cf. Figs. 6 and 7).

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