The CAS Registry Mumber 4930-53-4 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 4,9,3 and 0 respectively; the second part has 2 digits, 5 and 3 respectively. Calculate Digit Verification of CAS Registry Number 4930-53: (6*4)+(5*9)+(4*3)+(3*0)+(2*5)+(1*3)=94 94 % 10 = 4 So 4930-53-4 is a valid CAS Registry Number.
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