The CAS Registry Mumber 2209-10-1 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 2,2,0 and 9 respectively; the second part has 2 digits, 1 and 0 respectively. Calculate Digit Verification of CAS Registry Number 2209-10: (6*2)+(5*2)+(4*0)+(3*9)+(2*1)+(1*0)=51 51 % 10 = 1 So 2209-10-1 is a valid CAS Registry Number.
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