The CAS Registry Mumber 61923-93-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,1,9,2 and 3 respectively; the second part has 2 digits, 9 and 3 respectively. Calculate Digit Verification of CAS Registry Number 61923-93: (7*6)+(6*1)+(5*9)+(4*2)+(3*3)+(2*9)+(1*3)=131 131 % 10 = 1 So 61923-93-1 is a valid CAS Registry Number.
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