The CAS Registry Mumber 121053-18-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,1,0,5 and 3 respectively; the second part has 2 digits, 1 and 8 respectively. Calculate Digit Verification of CAS Registry Number 121053-18: (8*1)+(7*2)+(6*1)+(5*0)+(4*5)+(3*3)+(2*1)+(1*8)=67 67 % 10 = 7 So 121053-18-7 is a valid CAS Registry Number.
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