The CAS Registry Mumber 65919-85-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,5,9,1 and 9 respectively; the second part has 2 digits, 8 and 5 respectively. Calculate Digit Verification of CAS Registry Number 65919-85: (7*6)+(6*5)+(5*9)+(4*1)+(3*9)+(2*8)+(1*5)=169 169 % 10 = 9 So 65919-85-9 is a valid CAS Registry Number.
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