The CAS Registry Mumber 187-53-1 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 1,8 and 7 respectively; the second part has 2 digits, 5 and 3 respectively. Calculate Digit Verification of CAS Registry Number 187-53: (5*1)+(4*8)+(3*7)+(2*5)+(1*3)=71 71 % 10 = 1 So 187-53-1 is a valid CAS Registry Number.
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