The CAS Registry Mumber 5905-03-3 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 5,9,0 and 5 respectively; the second part has 2 digits, 0 and 3 respectively. Calculate Digit Verification of CAS Registry Number 5905-03: (6*5)+(5*9)+(4*0)+(3*5)+(2*0)+(1*3)=93 93 % 10 = 3 So 5905-03-3 is a valid CAS Registry Number.
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