The CAS Registry Mumber 5923-30-8 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 5,9,2 and 3 respectively; the second part has 2 digits, 3 and 0 respectively. Calculate Digit Verification of CAS Registry Number 5923-30: (6*5)+(5*9)+(4*2)+(3*3)+(2*3)+(1*0)=98 98 % 10 = 8 So 5923-30-8 is a valid CAS Registry Number.
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