The CAS Registry Mumber 185120-81-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,5,1,2 and 0 respectively; the second part has 2 digits, 8 and 1 respectively. Calculate Digit Verification of CAS Registry Number 185120-81: (8*1)+(7*8)+(6*5)+(5*1)+(4*2)+(3*0)+(2*8)+(1*1)=124 124 % 10 = 4 So 185120-81-4 is a valid CAS Registry Number.
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