The CAS Registry Mumber 70528-72-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,0,5,2 and 8 respectively; the second part has 2 digits, 7 and 2 respectively. Calculate Digit Verification of CAS Registry Number 70528-72: (7*7)+(6*0)+(5*5)+(4*2)+(3*8)+(2*7)+(1*2)=122 122 % 10 = 2 So 70528-72-2 is a valid CAS Registry Number.
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