The CAS Registry Mumber 67347-99-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,7,3,4 and 7 respectively; the second part has 2 digits, 9 and 9 respectively. Calculate Digit Verification of CAS Registry Number 67347-99: (7*6)+(6*7)+(5*3)+(4*4)+(3*7)+(2*9)+(1*9)=163 163 % 10 = 3 So 67347-99-3 is a valid CAS Registry Number.
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