The CAS Registry Mumber 2019-59-2 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 2,0,1 and 9 respectively; the second part has 2 digits, 5 and 9 respectively. Calculate Digit Verification of CAS Registry Number 2019-59: (6*2)+(5*0)+(4*1)+(3*9)+(2*5)+(1*9)=62 62 % 10 = 2 So 2019-59-2 is a valid CAS Registry Number.
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