The CAS Registry Mumber 1228552-50-8 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,2,2,8,5,5 and 2 respectively; the second part has 2 digits, 5 and 0 respectively. Calculate Digit Verification of CAS Registry Number 1228552-50: (9*1)+(8*2)+(7*2)+(6*8)+(5*5)+(4*5)+(3*2)+(2*5)+(1*0)=148 148 % 10 = 8 So 1228552-50-8 is a valid CAS Registry Number.
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