The CAS Registry Mumber 23944-26-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,3,9,4 and 4 respectively; the second part has 2 digits, 2 and 6 respectively. Calculate Digit Verification of CAS Registry Number 23944-26: (7*2)+(6*3)+(5*9)+(4*4)+(3*4)+(2*2)+(1*6)=115 115 % 10 = 5 So 23944-26-5 is a valid CAS Registry Number.
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