639057-68-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 639057-68-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,3,9,0,5 and 7 respectively; the second part has 2 digits, 6 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 639057-68:
(8*6)+(7*3)+(6*9)+(5*0)+(4*5)+(3*7)+(2*6)+(1*8)=184
184 % 10 = 4
So 639057-68-4 is a valid CAS Registry Number.