The CAS Registry Mumber 150418-20-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,0,4,1 and 8 respectively; the second part has 2 digits, 2 and 0 respectively. Calculate Digit Verification of CAS Registry Number 150418-20: (8*1)+(7*5)+(6*0)+(5*4)+(4*1)+(3*8)+(2*2)+(1*0)=95 95 % 10 = 5 So 150418-20-5 is a valid CAS Registry Number.
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