The CAS Registry Mumber 222417-26-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,2,2,4,1 and 7 respectively; the second part has 2 digits, 2 and 6 respectively. Calculate Digit Verification of CAS Registry Number 222417-26: (8*2)+(7*2)+(6*2)+(5*4)+(4*1)+(3*7)+(2*2)+(1*6)=97 97 % 10 = 7 So 222417-26-7 is a valid CAS Registry Number.
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