The CAS Registry Mumber 440356-63-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 4,4,0,3,5 and 6 respectively; the second part has 2 digits, 6 and 3 respectively. Calculate Digit Verification of CAS Registry Number 440356-63: (8*4)+(7*4)+(6*0)+(5*3)+(4*5)+(3*6)+(2*6)+(1*3)=128 128 % 10 = 8 So 440356-63-8 is a valid CAS Registry Number.
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