The CAS Registry Mumber 63543-05-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,3,5,4 and 3 respectively; the second part has 2 digits, 0 and 5 respectively. Calculate Digit Verification of CAS Registry Number 63543-05: (7*6)+(6*3)+(5*5)+(4*4)+(3*3)+(2*0)+(1*5)=115 115 % 10 = 5 So 63543-05-5 is a valid CAS Registry Number.
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