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540738-13-4

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540738-13-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 540738-13-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 5,4,0,7,3 and 8 respectively; the second part has 2 digits, 1 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 540738-13:
(8*5)+(7*4)+(6*0)+(5*7)+(4*3)+(3*8)+(2*1)+(1*3)=144
144 % 10 = 4
So 540738-13-4 is a valid CAS Registry Number.

540738-13-4Relevant articles and documents

Design, synthesis and photochemical properties of caged bile acids

Hirayama, Yuuki,Iwamura, Michiko,Furuta, Toshiaki

, p. 905 - 908 (2003)

Photolabile derivatives of bile acids (8-10 and 13) were synthesized via silver (I) oxide promoted selective etherification of 3α-hydroxyls. Quantitative production of the parent cholic acid was detected from the photolytic mixture of 3-NB-CA (8) in Tris buffered solution. Interestingly, the unexpectedly stable nitroso-hemiacetal intermediate (14) was detected when the photolysis was conducted in methanol. The enzymatic analysis using 7α-HSDH showed 8 and 9 could serve as caged bile acids that might be able to regulate certain biological processes upon UV irradiation.

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