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213819-19-3

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213819-19-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 213819-19-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,1,3,8,1 and 9 respectively; the second part has 2 digits, 1 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 213819-19:
(8*2)+(7*1)+(6*3)+(5*8)+(4*1)+(3*9)+(2*1)+(1*9)=123
123 % 10 = 3
So 213819-19-3 is a valid CAS Registry Number.

213819-19-3Relevant articles and documents

Process for the preparation of estetrol

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, (2011/11/12)

The present invention relates to a process for the preparation of estra-1,3,5(10)-trien-3,15α,16α,17β-tetraol (estetrol), via a silyl enol ether derivative 17-B-oxy-3-A-oxy-estra-1,3,5(10),16-tetraene, wherein A is a protecting group and B is ―Si(R2)3. The invention further relates to a process for the synthesis of 3-A-oxy-estra-1,3,5(10),15-tetraen-17-one, wherein A is a protecting group, via said silyl enol ether derivative.

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