23990-56-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 23990-56-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,3,9,9 and 0 respectively; the second part has 2 digits, 5 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 23990-56:
(7*2)+(6*3)+(5*9)+(4*9)+(3*0)+(2*5)+(1*6)=129
129 % 10 = 9
So 23990-56-9 is a valid CAS Registry Number.