18011-21-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 18011-21-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,8,0,1 and 1 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 18011-21:
(7*1)+(6*8)+(5*0)+(4*1)+(3*1)+(2*2)+(1*1)=67
67 % 10 = 7
So 18011-21-7 is a valid CAS Registry Number.