557781-44-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 557781-44-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 5,5,7,7,8 and 1 respectively; the second part has 2 digits, 4 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 557781-44:
(8*5)+(7*5)+(6*7)+(5*7)+(4*8)+(3*1)+(2*4)+(1*4)=199
199 % 10 = 9
So 557781-44-9 is a valid CAS Registry Number.