The CAS Registry Mumber 99761-08-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,9,7,6 and 1 respectively; the second part has 2 digits, 0 and 8 respectively. Calculate Digit Verification of CAS Registry Number 99761-08: (7*9)+(6*9)+(5*7)+(4*6)+(3*1)+(2*0)+(1*8)=187 187 % 10 = 7 So 99761-08-7 is a valid CAS Registry Number.
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