640771-80-8 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 640771-80-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,4,0,7,7 and 1 respectively; the second part has 2 digits, 8 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 640771-80:
(8*6)+(7*4)+(6*0)+(5*7)+(4*7)+(3*1)+(2*8)+(1*0)=158
158 % 10 = 8
So 640771-80-8 is a valid CAS Registry Number.