21801-90-1 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 21801-90-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,8,0 and 1 respectively; the second part has 2 digits, 9 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 21801-90:
(7*2)+(6*1)+(5*8)+(4*0)+(3*1)+(2*9)+(1*0)=81
81 % 10 = 1
So 21801-90-1 is a valid CAS Registry Number.
InChI:InChI=1/C9H9N3O/c1-6-3-2-4-12-7(8(10)13)5-11-9(6)12/h2-5H,1H3,(H2,10,13)