721923-21-3 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 721923-21-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 7,2,1,9,2 and 3 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 721923-21:
(8*7)+(7*2)+(6*1)+(5*9)+(4*2)+(3*3)+(2*2)+(1*1)=143
143 % 10 = 3
So 721923-21-3 is a valid CAS Registry Number.