The CAS Registry Mumber 132561-08-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,2,5,6 and 1 respectively; the second part has 2 digits, 0 and 8 respectively. Calculate Digit Verification of CAS Registry Number 132561-08: (8*1)+(7*3)+(6*2)+(5*5)+(4*6)+(3*1)+(2*0)+(1*8)=101 101 % 10 = 1 So 132561-08-1 is a valid CAS Registry Number.
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