The CAS Registry Mumber 5722-81-6 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 5,7,2 and 2 respectively; the second part has 2 digits, 8 and 1 respectively. Calculate Digit Verification of CAS Registry Number 5722-81: (6*5)+(5*7)+(4*2)+(3*2)+(2*8)+(1*1)=96 96 % 10 = 6 So 5722-81-6 is a valid CAS Registry Number.
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