The CAS Registry Mumber 74421-07-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,4,4,2 and 1 respectively; the second part has 2 digits, 0 and 7 respectively. Calculate Digit Verification of CAS Registry Number 74421-07: (7*7)+(6*4)+(5*4)+(4*2)+(3*1)+(2*0)+(1*7)=111 111 % 10 = 1 So 74421-07-1 is a valid CAS Registry Number.
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