The CAS Registry Mumber 887570-64-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 8,8,7,5,7 and 0 respectively; the second part has 2 digits, 6 and 4 respectively. Calculate Digit Verification of CAS Registry Number 887570-64: (8*8)+(7*8)+(6*7)+(5*5)+(4*7)+(3*0)+(2*6)+(1*4)=231 231 % 10 = 1 So 887570-64-1 is a valid CAS Registry Number.
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