The CAS Registry Mumber 691887-93-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,9,1,8,8 and 7 respectively; the second part has 2 digits, 9 and 3 respectively. Calculate Digit Verification of CAS Registry Number 691887-93: (8*6)+(7*9)+(6*1)+(5*8)+(4*8)+(3*7)+(2*9)+(1*3)=231 231 % 10 = 1 So 691887-93-1 is a valid CAS Registry Number.
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