The CAS Registry Mumber 671-99-8 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 6,7 and 1 respectively; the second part has 2 digits, 9 and 9 respectively. Calculate Digit Verification of CAS Registry Number 671-99: (5*6)+(4*7)+(3*1)+(2*9)+(1*9)=88 88 % 10 = 8 So 671-99-8 is a valid CAS Registry Number.
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