The CAS Registry Mumber 183619-27-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,3,6,1 and 9 respectively; the second part has 2 digits, 2 and 7 respectively. Calculate Digit Verification of CAS Registry Number 183619-27: (8*1)+(7*8)+(6*3)+(5*6)+(4*1)+(3*9)+(2*2)+(1*7)=154 154 % 10 = 4 So 183619-27-4 is a valid CAS Registry Number.
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