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117019-33-7

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117019-33-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 117019-33-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,7,0,1 and 9 respectively; the second part has 2 digits, 3 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 117019-33:
(8*1)+(7*1)+(6*7)+(5*0)+(4*1)+(3*9)+(2*3)+(1*3)=97
97 % 10 = 7
So 117019-33-7 is a valid CAS Registry Number.

117019-33-7Relevant articles and documents

Synthesis of Sequential Polydepsipeptides Involving Depsipeptide Formation by the 2-Nitrophenylsulphenyl N-Carboxy α-Amino Acid Anhydride (Nps-NCA) Method

Katakai, Ryoichi

, p. 2249 - 2252 (2007/10/02)

Sequential polydepsipeptides containing a tripeptide sequence Ala-Ala-Glu(OEt) and various α-hydroxy acids have been successfully prepared by polycondensation of tetradepsipeptide pentachlorophenyl esters.The latter were synthesized by preparation of didepsipeptide free acids by the Nps-NCA method followed by active esterification and peptide chain elongation by the so-called 'back-up' procedure.

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