The CAS Registry Mumber 191674-87-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,9,1,6,7 and 4 respectively; the second part has 2 digits, 8 and 7 respectively. Calculate Digit Verification of CAS Registry Number 191674-87: (8*1)+(7*9)+(6*1)+(5*6)+(4*7)+(3*4)+(2*8)+(1*7)=170 170 % 10 = 0 So 191674-87-0 is a valid CAS Registry Number.
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