The CAS Registry Mumber 22477-77-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,2,4,7 and 7 respectively; the second part has 2 digits, 7 and 7 respectively. Calculate Digit Verification of CAS Registry Number 22477-77: (7*2)+(6*2)+(5*4)+(4*7)+(3*7)+(2*7)+(1*7)=116 116 % 10 = 6 So 22477-77-6 is a valid CAS Registry Number.
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