The CAS Registry Mumber 19399-09-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,9,3,9 and 9 respectively; the second part has 2 digits, 0 and 9 respectively. Calculate Digit Verification of CAS Registry Number 19399-09: (7*1)+(6*9)+(5*3)+(4*9)+(3*9)+(2*0)+(1*9)=148 148 % 10 = 8 So 19399-09-8 is a valid CAS Registry Number.
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