The CAS Registry Mumber 75415-34-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,5,4,1 and 5 respectively; the second part has 2 digits, 3 and 4 respectively. Calculate Digit Verification of CAS Registry Number 75415-34: (7*7)+(6*5)+(5*4)+(4*1)+(3*5)+(2*3)+(1*4)=128 128 % 10 = 8 So 75415-34-8 is a valid CAS Registry Number.
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