1756-20-3 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 1756-20-3 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,7,5 and 6 respectively; the second part has 2 digits, 2 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 1756-20:
(6*1)+(5*7)+(4*5)+(3*6)+(2*2)+(1*0)=83
83 % 10 = 3
So 1756-20-3 is a valid CAS Registry Number.