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43221-20-1

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43221-20-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 43221-20-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 4,3,2,2 and 1 respectively; the second part has 2 digits, 2 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 43221-20:
(7*4)+(6*3)+(5*2)+(4*2)+(3*1)+(2*2)+(1*0)=71
71 % 10 = 1
So 43221-20-1 is a valid CAS Registry Number.

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