The CAS Registry Mumber 887567-81-9 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 7 respectively; the second part has 2 digits, 8 and 1 respectively. Calculate Digit Verification of CAS Registry Number 887567-81: (8*8)+(7*8)+(6*7)+(5*5)+(4*6)+(3*7)+(2*8)+(1*1)=249 249 % 10 = 9 So 887567-81-9 is a valid CAS Registry Number.
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