The CAS Registry Mumber 52211-61-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,2,2,1 and 1 respectively; the second part has 2 digits, 6 and 1 respectively. Calculate Digit Verification of CAS Registry Number 52211-61: (7*5)+(6*2)+(5*2)+(4*1)+(3*1)+(2*6)+(1*1)=77 77 % 10 = 7 So 52211-61-7 is a valid CAS Registry Number.
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