156991-32-1 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 156991-32-1 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 1 respectively; the second part has 2 digits, 3 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 156991-32:
(8*1)+(7*5)+(6*6)+(5*9)+(4*9)+(3*1)+(2*3)+(1*2)=171
171 % 10 = 1
So 156991-32-1 is a valid CAS Registry Number.