The CAS Registry Mumber 19216-69-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,9,2,1 and 6 respectively; the second part has 2 digits, 6 and 9 respectively. Calculate Digit Verification of CAS Registry Number 19216-69: (7*1)+(6*9)+(5*2)+(4*1)+(3*6)+(2*6)+(1*9)=114 114 % 10 = 4 So 19216-69-4 is a valid CAS Registry Number.
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