The CAS Registry Mumber 899404-02-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 8,9,9,4,0 and 4 respectively; the second part has 2 digits, 0 and 2 respectively. Calculate Digit Verification of CAS Registry Number 899404-02: (8*8)+(7*9)+(6*9)+(5*4)+(4*0)+(3*4)+(2*0)+(1*2)=215 215 % 10 = 5 So 899404-02-5 is a valid CAS Registry Number.
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