21538-74-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 21538-74-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,5,3 and 8 respectively; the second part has 2 digits, 7 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 21538-74:
(7*2)+(6*1)+(5*5)+(4*3)+(3*8)+(2*7)+(1*4)=99
99 % 10 = 9
So 21538-74-9 is a valid CAS Registry Number.