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639476-05-4

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639476-05-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 639476-05-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,3,9,4,7 and 6 respectively; the second part has 2 digits, 0 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 639476-05:
(8*6)+(7*3)+(6*9)+(5*4)+(4*7)+(3*6)+(2*0)+(1*5)=194
194 % 10 = 4
So 639476-05-4 is a valid CAS Registry Number.

639476-05-4Relevant articles and documents

Synthesis of 4-azido-4-deoxy-neu5,7,8,9ac42en1me. A key intermediate for the synthesis of GG167 from D-glucono-δ-lactone

Liu, Ke-Gang,Yan, Shi,Wu, Yu-Lin,Yao, Zhu-Jun

, p. 2269 - 2272 (2007/10/03)

Stereoselective synthesis of 5-acetamido-7,8,9-tri-O-acetyl-2,6-anhydro-4- azido-3,4,5-trideoxy-D-glycero-D-galacto-non-2-enonic acid methyl ester, an advanced key intermediate for the synthesis of neuraminidase inhibitor GG167 (Zanamivir, Relenza), was accomplished using D-glucono-δ-lactone as starting material. A highly diastereoselective allyllation of an imine intermediate, a regioselective azide-opening of an aziridine, and chemoselective oxidations of vicinal diols served successfully as key steps.

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