The CAS Registry Mumber 28895-19-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,8,8,9 and 5 respectively; the second part has 2 digits, 1 and 9 respectively. Calculate Digit Verification of CAS Registry Number 28895-19: (7*2)+(6*8)+(5*8)+(4*9)+(3*5)+(2*1)+(1*9)=164 164 % 10 = 4 So 28895-19-4 is a valid CAS Registry Number.
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