21776-54-5 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 21776-54-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,7,7 and 6 respectively; the second part has 2 digits, 5 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 21776-54:
(7*2)+(6*1)+(5*7)+(4*7)+(3*6)+(2*5)+(1*4)=115
115 % 10 = 5
So 21776-54-5 is a valid CAS Registry Number.