The CAS Registry Mumber 1541-93-1 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,5,4 and 1 respectively; the second part has 2 digits, 9 and 3 respectively. Calculate Digit Verification of CAS Registry Number 1541-93: (6*1)+(5*5)+(4*4)+(3*1)+(2*9)+(1*3)=71 71 % 10 = 1 So 1541-93-1 is a valid CAS Registry Number.
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