The CAS Registry Mumber 187339-62-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,7,3,3 and 9 respectively; the second part has 2 digits, 6 and 2 respectively. Calculate Digit Verification of CAS Registry Number 187339-62: (8*1)+(7*8)+(6*7)+(5*3)+(4*3)+(3*9)+(2*6)+(1*2)=174 174 % 10 = 4 So 187339-62-4 is a valid CAS Registry Number.
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