The CAS Registry Mumber 19512-19-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,9,5,1 and 2 respectively; the second part has 2 digits, 1 and 9 respectively. Calculate Digit Verification of CAS Registry Number 19512-19: (7*1)+(6*9)+(5*5)+(4*1)+(3*2)+(2*1)+(1*9)=107 107 % 10 = 7 So 19512-19-7 is a valid CAS Registry Number.
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