21803-97-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 21803-97-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,8,0 and 3 respectively; the second part has 2 digits, 9 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 21803-97:
(7*2)+(6*1)+(5*8)+(4*0)+(3*3)+(2*9)+(1*7)=94
94 % 10 = 4
So 21803-97-4 is a valid CAS Registry Number.