The CAS Registry Mumber 307342-23-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 3,0,7,3,4 and 2 respectively; the second part has 2 digits, 2 and 3 respectively. Calculate Digit Verification of CAS Registry Number 307342-23: (8*3)+(7*0)+(6*7)+(5*3)+(4*4)+(3*2)+(2*2)+(1*3)=110 110 % 10 = 0 So 307342-23-0 is a valid CAS Registry Number.
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