19863-21-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 19863-21-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,9,8,6 and 3 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 19863-21:
(7*1)+(6*9)+(5*8)+(4*6)+(3*3)+(2*2)+(1*1)=139
139 % 10 = 9
So 19863-21-9 is a valid CAS Registry Number.