The CAS Registry Mumber 91722-39-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,1,7,2 and 2 respectively; the second part has 2 digits, 3 and 9 respectively. Calculate Digit Verification of CAS Registry Number 91722-39: (7*9)+(6*1)+(5*7)+(4*2)+(3*2)+(2*3)+(1*9)=133 133 % 10 = 3 So 91722-39-3 is a valid CAS Registry Number.
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