The CAS Registry Mumber 1434643-23-8 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,4,3,4,6,4 and 3 respectively; the second part has 2 digits, 2 and 3 respectively. Calculate Digit Verification of CAS Registry Number 1434643-23: (9*1)+(8*4)+(7*3)+(6*4)+(5*6)+(4*4)+(3*3)+(2*2)+(1*3)=148 148 % 10 = 8 So 1434643-23-8 is a valid CAS Registry Number.
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