The CAS Registry Mumber 132087-53-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,2,0,8 and 7 respectively; the second part has 2 digits, 5 and 3 respectively. Calculate Digit Verification of CAS Registry Number 132087-53: (8*1)+(7*3)+(6*2)+(5*0)+(4*8)+(3*7)+(2*5)+(1*3)=107 107 % 10 = 7 So 132087-53-7 is a valid CAS Registry Number.
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