The CAS Registry Mumber 374563-16-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 3,7,4,5,6 and 3 respectively; the second part has 2 digits, 1 and 6 respectively. Calculate Digit Verification of CAS Registry Number 374563-16: (8*3)+(7*7)+(6*4)+(5*5)+(4*6)+(3*3)+(2*1)+(1*6)=163 163 % 10 = 3 So 374563-16-3 is a valid CAS Registry Number.
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