The CAS Registry Mumber 887568-22-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 8,8,7,5,6 and 8 respectively; the second part has 2 digits, 2 and 2 respectively. Calculate Digit Verification of CAS Registry Number 887568-22: (8*8)+(7*8)+(6*7)+(5*5)+(4*6)+(3*8)+(2*2)+(1*2)=241 241 % 10 = 1 So 887568-22-1 is a valid CAS Registry Number.
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