The CAS Registry Mumber 521-26-6 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 5,2 and 1 respectively; the second part has 2 digits, 2 and 6 respectively. Calculate Digit Verification of CAS Registry Number 521-26: (5*5)+(4*2)+(3*1)+(2*2)+(1*6)=46 46 % 10 = 6 So 521-26-6 is a valid CAS Registry Number.
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