156997-80-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 156997-80-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,6,9,9 and 7 respectively; the second part has 2 digits, 8 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 156997-80:
(8*1)+(7*5)+(6*6)+(5*9)+(4*9)+(3*7)+(2*8)+(1*0)=197
197 % 10 = 7
So 156997-80-7 is a valid CAS Registry Number.