The CAS Registry Mumber 164414-38-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,6,4,4,1 and 4 respectively; the second part has 2 digits, 3 and 8 respectively. Calculate Digit Verification of CAS Registry Number 164414-38: (8*1)+(7*6)+(6*4)+(5*4)+(4*1)+(3*4)+(2*3)+(1*8)=124 124 % 10 = 4 So 164414-38-4 is a valid CAS Registry Number.
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