The CAS Registry Mumber 151661-97-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,1,6,6 and 1 respectively; the second part has 2 digits, 9 and 7 respectively. Calculate Digit Verification of CAS Registry Number 151661-97: (8*1)+(7*5)+(6*1)+(5*6)+(4*6)+(3*1)+(2*9)+(1*7)=131 131 % 10 = 1 So 151661-97-1 is a valid CAS Registry Number.
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