The CAS Registry Mumber 66030-89-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,6,0,3 and 0 respectively; the second part has 2 digits, 8 and 9 respectively. Calculate Digit Verification of CAS Registry Number 66030-89: (7*6)+(6*6)+(5*0)+(4*3)+(3*0)+(2*8)+(1*9)=115 115 % 10 = 5 So 66030-89-5 is a valid CAS Registry Number.
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