The CAS Registry Mumber 258278-04-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,5,8,2,7 and 8 respectively; the second part has 2 digits, 0 and 4 respectively. Calculate Digit Verification of CAS Registry Number 258278-04: (8*2)+(7*5)+(6*8)+(5*2)+(4*7)+(3*8)+(2*0)+(1*4)=165 165 % 10 = 5 So 258278-04-5 is a valid CAS Registry Number.
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