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444667-48-5

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444667-48-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 444667-48-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 4,4,4,6,6 and 7 respectively; the second part has 2 digits, 4 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 444667-48:
(8*4)+(7*4)+(6*4)+(5*6)+(4*6)+(3*7)+(2*4)+(1*8)=175
175 % 10 = 5
So 444667-48-5 is a valid CAS Registry Number.

444667-48-5Relevant articles and documents

A higher yielding synthesis of the clinical prodrug ZD2767P using di-protected 4-[N,N-bis(2-hydroxyethyl)amino]phenyl chloroformate

Niculescu-Duvaz, Dan,Scanlon, Ian,Niculescu-Duvaz, Ion,Springer, Caroline J.

, p. 6919 - 6922 (2005)

A novel synthesis is described of the prodrug ZD2767P (in Phase I/II clinical trials) that improves the overall yield from 13% to 45%. The method involves the synthesis of 4-[N,N-bis(2-hydroxyethyl)amino]phenyl chloroformate protected as the bis-silyl ether, coupled with di-tert-butyl glutamate. There are clear advantages of this method compared to the literature procedure.

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