The CAS Registry Mumber 7598-23-4 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 7,5,9 and 8 respectively; the second part has 2 digits, 2 and 3 respectively. Calculate Digit Verification of CAS Registry Number 7598-23: (6*7)+(5*5)+(4*9)+(3*8)+(2*2)+(1*3)=134 134 % 10 = 4 So 7598-23-4 is a valid CAS Registry Number.
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