The CAS Registry Mumber 444007-21-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 4,4,4,0,0 and 7 respectively; the second part has 2 digits, 2 and 1 respectively. Calculate Digit Verification of CAS Registry Number 444007-21: (8*4)+(7*4)+(6*4)+(5*0)+(4*0)+(3*7)+(2*2)+(1*1)=110 110 % 10 = 0 So 444007-21-0 is a valid CAS Registry Number.
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