The CAS Registry Mumber 121543-20-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,1,5,4 and 3 respectively; the second part has 2 digits, 2 and 0 respectively. Calculate Digit Verification of CAS Registry Number 121543-20: (8*1)+(7*2)+(6*1)+(5*5)+(4*4)+(3*3)+(2*2)+(1*0)=82 82 % 10 = 2 So 121543-20-2 is a valid CAS Registry Number.
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