The CAS Registry Mumber 219756-63-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,1,9,7,5 and 6 respectively; the second part has 2 digits, 6 and 3 respectively. Calculate Digit Verification of CAS Registry Number 219756-63: (8*2)+(7*1)+(6*9)+(5*7)+(4*5)+(3*6)+(2*6)+(1*3)=165 165 % 10 = 5 So 219756-63-5 is a valid CAS Registry Number.
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