The CAS Registry Mumber 79691-12-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,9,6,9 and 1 respectively; the second part has 2 digits, 1 and 2 respectively. Calculate Digit Verification of CAS Registry Number 79691-12: (7*7)+(6*9)+(5*6)+(4*9)+(3*1)+(2*1)+(1*2)=176 176 % 10 = 6 So 79691-12-6 is a valid CAS Registry Number.
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