The CAS Registry Mumber 5219-76-1 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 5,2,1 and 9 respectively; the second part has 2 digits, 7 and 6 respectively. Calculate Digit Verification of CAS Registry Number 5219-76: (6*5)+(5*2)+(4*1)+(3*9)+(2*7)+(1*6)=91 91 % 10 = 1 So 5219-76-1 is a valid CAS Registry Number.
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