The CAS Registry Mumber 287979-04-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,8,7,9,7 and 9 respectively; the second part has 2 digits, 0 and 4 respectively. Calculate Digit Verification of CAS Registry Number 287979-04: (8*2)+(7*8)+(6*7)+(5*9)+(4*7)+(3*9)+(2*0)+(1*4)=218 218 % 10 = 8 So 287979-04-8 is a valid CAS Registry Number.
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