The CAS Registry Mumber 213529-80-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,1,3,5,2 and 9 respectively; the second part has 2 digits, 8 and 0 respectively. Calculate Digit Verification of CAS Registry Number 213529-80: (8*2)+(7*1)+(6*3)+(5*5)+(4*2)+(3*9)+(2*8)+(1*0)=117 117 % 10 = 7 So 213529-80-7 is a valid CAS Registry Number.
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