The CAS Registry Mumber 72580-36-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,2,5,8 and 0 respectively; the second part has 2 digits, 3 and 6 respectively. Calculate Digit Verification of CAS Registry Number 72580-36: (7*7)+(6*2)+(5*5)+(4*8)+(3*0)+(2*3)+(1*6)=130 130 % 10 = 0 So 72580-36-0 is a valid CAS Registry Number.
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