The CAS Registry Mumber 1201591-18-5 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,2,0,1,5,9 and 1 respectively; the second part has 2 digits, 1 and 8 respectively. Calculate Digit Verification of CAS Registry Number 1201591-18: (9*1)+(8*2)+(7*0)+(6*1)+(5*5)+(4*9)+(3*1)+(2*1)+(1*8)=105 105 % 10 = 5 So 1201591-18-5 is a valid CAS Registry Number.
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