The CAS Registry Mumber 477-22-5 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 4,7 and 7 respectively; the second part has 2 digits, 2 and 2 respectively. Calculate Digit Verification of CAS Registry Number 477-22: (5*4)+(4*7)+(3*7)+(2*2)+(1*2)=75 75 % 10 = 5 So 477-22-5 is a valid CAS Registry Number.
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