The CAS Registry Mumber 19971-73-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,9,9,7 and 1 respectively; the second part has 2 digits, 7 and 3 respectively. Calculate Digit Verification of CAS Registry Number 19971-73: (7*1)+(6*9)+(5*9)+(4*7)+(3*1)+(2*7)+(1*3)=154 154 % 10 = 4 So 19971-73-4 is a valid CAS Registry Number.
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