The CAS Registry Mumber 185451-40-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,5,4,5 and 1 respectively; the second part has 2 digits, 4 and 0 respectively. Calculate Digit Verification of CAS Registry Number 185451-40: (8*1)+(7*8)+(6*5)+(5*4)+(4*5)+(3*1)+(2*4)+(1*0)=145 145 % 10 = 5 So 185451-40-5 is a valid CAS Registry Number.
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