21586-18-5 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 21586-18-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,5,8 and 6 respectively; the second part has 2 digits, 1 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 21586-18:
(7*2)+(6*1)+(5*5)+(4*8)+(3*6)+(2*1)+(1*8)=105
105 % 10 = 5
So 21586-18-5 is a valid CAS Registry Number.