The CAS Registry Mumber 4407-90-3 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 4,4,0 and 7 respectively; the second part has 2 digits, 9 and 0 respectively. Calculate Digit Verification of CAS Registry Number 4407-90: (6*4)+(5*4)+(4*0)+(3*7)+(2*9)+(1*0)=83 83 % 10 = 3 So 4407-90-3 is a valid CAS Registry Number.
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