The CAS Registry Mumber 1172300-30-9 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,1,7,2,3,0 and 0 respectively; the second part has 2 digits, 3 and 0 respectively. Calculate Digit Verification of CAS Registry Number 1172300-30: (9*1)+(8*1)+(7*7)+(6*2)+(5*3)+(4*0)+(3*0)+(2*3)+(1*0)=99 99 % 10 = 9 So 1172300-30-9 is a valid CAS Registry Number.
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