The CAS Registry Mumber 353497-67-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 3,5,3,4,9 and 7 respectively; the second part has 2 digits, 6 and 7 respectively. Calculate Digit Verification of CAS Registry Number 353497-67: (8*3)+(7*5)+(6*3)+(5*4)+(4*9)+(3*7)+(2*6)+(1*7)=173 173 % 10 = 3 So 353497-67-3 is a valid CAS Registry Number.
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