The CAS Registry Mumber 20521-06-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,0,5,2 and 1 respectively; the second part has 2 digits, 0 and 6 respectively. Calculate Digit Verification of CAS Registry Number 20521-06: (7*2)+(6*0)+(5*5)+(4*2)+(3*1)+(2*0)+(1*6)=56 56 % 10 = 6 So 20521-06-6 is a valid CAS Registry Number.
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