642985-49-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 642985-49-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,4,2,9,8 and 5 respectively; the second part has 2 digits, 4 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 642985-49:
(8*6)+(7*4)+(6*2)+(5*9)+(4*8)+(3*5)+(2*4)+(1*9)=197
197 % 10 = 7
So 642985-49-7 is a valid CAS Registry Number.