The CAS Registry Mumber 64312-53-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,4,3,1 and 2 respectively; the second part has 2 digits, 5 and 3 respectively. Calculate Digit Verification of CAS Registry Number 64312-53: (7*6)+(6*4)+(5*3)+(4*1)+(3*2)+(2*5)+(1*3)=104 104 % 10 = 4 So 64312-53-4 is a valid CAS Registry Number.
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