21729-09-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 21729-09-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,7,2 and 9 respectively; the second part has 2 digits, 0 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 21729-09:
(7*2)+(6*1)+(5*7)+(4*2)+(3*9)+(2*0)+(1*9)=99
99 % 10 = 9
So 21729-09-9 is a valid CAS Registry Number.