The CAS Registry Mumber 5721-93-7 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 5,7,2 and 1 respectively; the second part has 2 digits, 9 and 3 respectively. Calculate Digit Verification of CAS Registry Number 5721-93: (6*5)+(5*7)+(4*2)+(3*1)+(2*9)+(1*3)=97 97 % 10 = 7 So 5721-93-7 is a valid CAS Registry Number.
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