The CAS Registry Mumber 190391-21-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,9,0,3,9 and 1 respectively; the second part has 2 digits, 2 and 1 respectively. Calculate Digit Verification of CAS Registry Number 190391-21: (8*1)+(7*9)+(6*0)+(5*3)+(4*9)+(3*1)+(2*2)+(1*1)=130 130 % 10 = 0 So 190391-21-0 is a valid CAS Registry Number.
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