The CAS Registry Mumber 669745-81-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,6,9,7,4 and 5 respectively; the second part has 2 digits, 8 and 1 respectively. Calculate Digit Verification of CAS Registry Number 669745-81: (8*6)+(7*6)+(6*9)+(5*7)+(4*4)+(3*5)+(2*8)+(1*1)=227 227 % 10 = 7 So 669745-81-7 is a valid CAS Registry Number.
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