The CAS Registry Mumber 845790-54-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 8,4,5,7,9 and 0 respectively; the second part has 2 digits, 5 and 4 respectively. Calculate Digit Verification of CAS Registry Number 845790-54: (8*8)+(7*4)+(6*5)+(5*7)+(4*9)+(3*0)+(2*5)+(1*4)=207 207 % 10 = 7 So 845790-54-7 is a valid CAS Registry Number.
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