The CAS Registry Mumber 155552-11-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,5,5,5 and 2 respectively; the second part has 2 digits, 1 and 1 respectively. Calculate Digit Verification of CAS Registry Number 155552-11: (8*1)+(7*5)+(6*5)+(5*5)+(4*5)+(3*2)+(2*1)+(1*1)=127 127 % 10 = 7 So 155552-11-7 is a valid CAS Registry Number.
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