The CAS Registry Mumber 23188-63-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,3,1,8 and 8 respectively; the second part has 2 digits, 6 and 3 respectively. Calculate Digit Verification of CAS Registry Number 23188-63: (7*2)+(6*3)+(5*1)+(4*8)+(3*8)+(2*6)+(1*3)=108 108 % 10 = 8 So 23188-63-8 is a valid CAS Registry Number.
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