The CAS Registry Mumber 2285-26-9 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 2,2,8 and 5 respectively; the second part has 2 digits, 2 and 6 respectively. Calculate Digit Verification of CAS Registry Number 2285-26: (6*2)+(5*2)+(4*8)+(3*5)+(2*2)+(1*6)=79 79 % 10 = 9 So 2285-26-9 is a valid CAS Registry Number.
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