The CAS Registry Mumber 5885-99-4 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 5,8,8 and 5 respectively; the second part has 2 digits, 9 and 9 respectively. Calculate Digit Verification of CAS Registry Number 5885-99: (6*5)+(5*8)+(4*8)+(3*5)+(2*9)+(1*9)=144 144 % 10 = 4 So 5885-99-4 is a valid CAS Registry Number.
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