The CAS Registry Mumber 1674390-11-4 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,6,7,4,3,9 and 0 respectively; the second part has 2 digits, 1 and 1 respectively. Calculate Digit Verification of CAS Registry Number 1674390-11: (9*1)+(8*6)+(7*7)+(6*4)+(5*3)+(4*9)+(3*0)+(2*1)+(1*1)=184 184 % 10 = 4 So 1674390-11-4 is a valid CAS Registry Number.
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