The CAS Registry Mumber 90866-87-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,0,8,6 and 6 respectively; the second part has 2 digits, 8 and 7 respectively. Calculate Digit Verification of CAS Registry Number 90866-87: (7*9)+(6*0)+(5*8)+(4*6)+(3*6)+(2*8)+(1*7)=168 168 % 10 = 8 So 90866-87-8 is a valid CAS Registry Number.
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