The CAS Registry Mumber 173994-76-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,7,3,9,9 and 4 respectively; the second part has 2 digits, 7 and 6 respectively. Calculate Digit Verification of CAS Registry Number 173994-76: (8*1)+(7*7)+(6*3)+(5*9)+(4*9)+(3*4)+(2*7)+(1*6)=188 188 % 10 = 8 So 173994-76-8 is a valid CAS Registry Number.
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