The CAS Registry Mumber 67722-66-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,7,7,2 and 2 respectively; the second part has 2 digits, 6 and 6 respectively. Calculate Digit Verification of CAS Registry Number 67722-66: (7*6)+(6*7)+(5*7)+(4*2)+(3*2)+(2*6)+(1*6)=151 151 % 10 = 1 So 67722-66-1 is a valid CAS Registry Number.
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