The CAS Registry Mumber 21230-85-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,2,3 and 0 respectively; the second part has 2 digits, 8 and 5 respectively. Calculate Digit Verification of CAS Registry Number 21230-85: (7*2)+(6*1)+(5*2)+(4*3)+(3*0)+(2*8)+(1*5)=63 63 % 10 = 3 So 21230-85-3 is a valid CAS Registry Number.
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