438221-65-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 438221-65-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 4,3,8,2,2 and 1 respectively; the second part has 2 digits, 6 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 438221-65:
(8*4)+(7*3)+(6*8)+(5*2)+(4*2)+(3*1)+(2*6)+(1*5)=139
139 % 10 = 9
So 438221-65-9 is a valid CAS Registry Number.