The CAS Registry Mumber 2926-77-4 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 2,9,2 and 6 respectively; the second part has 2 digits, 7 and 7 respectively. Calculate Digit Verification of CAS Registry Number 2926-77: (6*2)+(5*9)+(4*2)+(3*6)+(2*7)+(1*7)=104 104 % 10 = 4 So 2926-77-4 is a valid CAS Registry Number.
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