The CAS Registry Mumber 123768-22-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,3,7,6 and 8 respectively; the second part has 2 digits, 2 and 2 respectively. Calculate Digit Verification of CAS Registry Number 123768-22: (8*1)+(7*2)+(6*3)+(5*7)+(4*6)+(3*8)+(2*2)+(1*2)=129 129 % 10 = 9 So 123768-22-9 is a valid CAS Registry Number.
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