The CAS Registry Mumber 90899-27-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,0,8,9 and 9 respectively; the second part has 2 digits, 2 and 7 respectively. Calculate Digit Verification of CAS Registry Number 90899-27: (7*9)+(6*0)+(5*8)+(4*9)+(3*9)+(2*2)+(1*7)=177 177 % 10 = 7 So 90899-27-7 is a valid CAS Registry Number.
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