The CAS Registry Mumber 35428-64-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,5,4,2 and 8 respectively; the second part has 2 digits, 6 and 4 respectively. Calculate Digit Verification of CAS Registry Number 35428-64: (7*3)+(6*5)+(5*4)+(4*2)+(3*8)+(2*6)+(1*4)=119 119 % 10 = 9 So 35428-64-9 is a valid CAS Registry Number.
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