The CAS Registry Mumber 887747-99-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 8,8,7,7,4 and 7 respectively; the second part has 2 digits, 9 and 9 respectively. Calculate Digit Verification of CAS Registry Number 887747-99: (8*8)+(7*8)+(6*7)+(5*7)+(4*4)+(3*7)+(2*9)+(1*9)=261 261 % 10 = 1 So 887747-99-1 is a valid CAS Registry Number.
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