21887-66-1 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 21887-66-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,8,8 and 7 respectively; the second part has 2 digits, 6 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 21887-66:
(7*2)+(6*1)+(5*8)+(4*8)+(3*7)+(2*6)+(1*6)=131
131 % 10 = 1
So 21887-66-1 is a valid CAS Registry Number.