The CAS Registry Mumber 72230-81-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,2,2,3 and 0 respectively; the second part has 2 digits, 8 and 1 respectively. Calculate Digit Verification of CAS Registry Number 72230-81: (7*7)+(6*2)+(5*2)+(4*3)+(3*0)+(2*8)+(1*1)=100 100 % 10 = 0 So 72230-81-0 is a valid CAS Registry Number.
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