The CAS Registry Mumber 22660-97-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,2,6,6 and 0 respectively; the second part has 2 digits, 9 and 7 respectively. Calculate Digit Verification of CAS Registry Number 22660-97: (7*2)+(6*2)+(5*6)+(4*6)+(3*0)+(2*9)+(1*7)=105 105 % 10 = 5 So 22660-97-5 is a valid CAS Registry Number.
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