20817-05-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 20817-05-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,0,8,1 and 7 respectively; the second part has 2 digits, 0 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 20817-05:
(7*2)+(6*0)+(5*8)+(4*1)+(3*7)+(2*0)+(1*5)=84
84 % 10 = 4
So 20817-05-4 is a valid CAS Registry Number.
20817-05-4Relevant articles and documents
O-Nitro(thio)phenol derivatives, and their preparation
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, (2008/06/13)
The invention relates to novel o-nitrophenol derivatives and o-nitrothiophenol derivatives of the following structure: where: A1to A3are—independently of one another—H, F, CH3, CF3, OCH3, OCF3/s