42303-21-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 42303-21-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 4,2,3,0 and 3 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 42303-21:
(7*4)+(6*2)+(5*3)+(4*0)+(3*3)+(2*2)+(1*1)=69
69 % 10 = 9
So 42303-21-9 is a valid CAS Registry Number.