The CAS Registry Mumber 887569-56-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 8,8,7,5,6 and 9 respectively; the second part has 2 digits, 5 and 6 respectively. Calculate Digit Verification of CAS Registry Number 887569-56: (8*8)+(7*8)+(6*7)+(5*5)+(4*6)+(3*9)+(2*5)+(1*6)=254 254 % 10 = 4 So 887569-56-4 is a valid CAS Registry Number.
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