The CAS Registry Mumber 56422-54-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,6,4,2 and 2 respectively; the second part has 2 digits, 5 and 4 respectively. Calculate Digit Verification of CAS Registry Number 56422-54: (7*5)+(6*6)+(5*4)+(4*2)+(3*2)+(2*5)+(1*4)=119 119 % 10 = 9 So 56422-54-9 is a valid CAS Registry Number.
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