The CAS Registry Mumber 90047-21-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,0,0,4 and 7 respectively; the second part has 2 digits, 2 and 1 respectively. Calculate Digit Verification of CAS Registry Number 90047-21: (7*9)+(6*0)+(5*0)+(4*4)+(3*7)+(2*2)+(1*1)=105 105 % 10 = 5 So 90047-21-5 is a valid CAS Registry Number.
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