The CAS Registry Mumber 1208491-86-4 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,2,0,8,4,9 and 1 respectively; the second part has 2 digits, 8 and 6 respectively. Calculate Digit Verification of CAS Registry Number 1208491-86: (9*1)+(8*2)+(7*0)+(6*8)+(5*4)+(4*9)+(3*1)+(2*8)+(1*6)=154 154 % 10 = 4 So 1208491-86-4 is a valid CAS Registry Number.
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