642993-69-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 642993-69-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,4,2,9,9 and 3 respectively; the second part has 2 digits, 6 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 642993-69:
(8*6)+(7*4)+(6*2)+(5*9)+(4*9)+(3*3)+(2*6)+(1*9)=199
199 % 10 = 9
So 642993-69-9 is a valid CAS Registry Number.