The CAS Registry Mumber 4207-03-8 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 4,2,0 and 7 respectively; the second part has 2 digits, 0 and 3 respectively. Calculate Digit Verification of CAS Registry Number 4207-03: (6*4)+(5*2)+(4*0)+(3*7)+(2*0)+(1*3)=58 58 % 10 = 8 So 4207-03-8 is a valid CAS Registry Number.
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