The CAS Registry Mumber 159551-32-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,9,5,5 and 1 respectively; the second part has 2 digits, 3 and 2 respectively. Calculate Digit Verification of CAS Registry Number 159551-32: (8*1)+(7*5)+(6*9)+(5*5)+(4*5)+(3*1)+(2*3)+(1*2)=153 153 % 10 = 3 So 159551-32-3 is a valid CAS Registry Number.
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