The CAS Registry Mumber 885521-97-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 8,8,5,5,2 and 1 respectively; the second part has 2 digits, 9 and 7 respectively. Calculate Digit Verification of CAS Registry Number 885521-97: (8*8)+(7*8)+(6*5)+(5*5)+(4*2)+(3*1)+(2*9)+(1*7)=211 211 % 10 = 1 So 885521-97-1 is a valid CAS Registry Number.
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