The CAS Registry Mumber 885523-31-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 8,8,5,5,2 and 3 respectively; the second part has 2 digits, 3 and 1 respectively. Calculate Digit Verification of CAS Registry Number 885523-31: (8*8)+(7*8)+(6*5)+(5*5)+(4*2)+(3*3)+(2*3)+(1*1)=199 199 % 10 = 9 So 885523-31-9 is a valid CAS Registry Number.
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