The CAS Registry Mumber 59800-21-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,9,8,0 and 0 respectively; the second part has 2 digits, 2 and 1 respectively. Calculate Digit Verification of CAS Registry Number 59800-21: (7*5)+(6*9)+(5*8)+(4*0)+(3*0)+(2*2)+(1*1)=134 134 % 10 = 4 So 59800-21-4 is a valid CAS Registry Number.
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