The CAS Registry Mumber 19814-42-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,9,8,1 and 4 respectively; the second part has 2 digits, 4 and 2 respectively. Calculate Digit Verification of CAS Registry Number 19814-42: (7*1)+(6*9)+(5*8)+(4*1)+(3*4)+(2*4)+(1*2)=127 127 % 10 = 7 So 19814-42-7 is a valid CAS Registry Number.
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