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113304-79-3

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113304-79-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 113304-79-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,3,3,0 and 4 respectively; the second part has 2 digits, 7 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 113304-79:
(8*1)+(7*1)+(6*3)+(5*3)+(4*0)+(3*4)+(2*7)+(1*9)=83
83 % 10 = 3
So 113304-79-3 is a valid CAS Registry Number.

113304-79-3Relevant articles and documents

APPLICATION OF CINNAMYLOXYCARBONYL (Coc) PROTECTION DURING THE SYNTHESIS OF Coc-Pro-MePhe-MeAla-OMe. CHAIN RUPTURE OF THE TRIPEPTIDE ON CHROMATOGRAPHY.

Sharma, N.K.,Anteunis, M.J.O.

, p. 467 - 472 (2007/10/02)

The preparation of 1-(cinnamyloxycarbonyloxy)benztriazole (Coc-OBt), as reported in literature, results in a mixture of 50percent Coc-OBt (6) next to 13percent of 1-(cinnamyloxy)benztriazole (7).The reagent 6 is stable for several months in the fridge.Coc-protection of Pro can be obtained in an improved yield by a slightly modified procedure.Coc-Pro-MePhe-MeAla-OMe was prepared in good yields using BOP-Cl as the activator for coupling.In an attempt to isolate the tripeptide by chromatography on SiO2 we found it to decompose into Coc-Pro and the cyclic dipeptide (DKP) c(MePhe-MeAla).The same DKP is formed from the dipeptide ester salt Tfa.MePhe-MeAla-OMe on standing in CDCl3.These findings stress the ease of chain rupture of peptides caused by acidic agents when they possess a triad of N-alkylated amino acids (3).

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