21905-93-1 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 21905-93-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,9,0 and 5 respectively; the second part has 2 digits, 9 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 21905-93:
(7*2)+(6*1)+(5*9)+(4*0)+(3*5)+(2*9)+(1*3)=101
101 % 10 = 1
So 21905-93-1 is a valid CAS Registry Number.