The CAS Registry Mumber 21165-53-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,1,6 and 5 respectively; the second part has 2 digits, 5 and 3 respectively. Calculate Digit Verification of CAS Registry Number 21165-53: (7*2)+(6*1)+(5*1)+(4*6)+(3*5)+(2*5)+(1*3)=77 77 % 10 = 7 So 21165-53-7 is a valid CAS Registry Number.
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