The CAS Registry Mumber 304-90-5 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 3,0 and 4 respectively; the second part has 2 digits, 9 and 0 respectively. Calculate Digit Verification of CAS Registry Number 304-90: (5*3)+(4*0)+(3*4)+(2*9)+(1*0)=45 45 % 10 = 5 So 304-90-5 is a valid CAS Registry Number.
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