137720-42-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 137720-42-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,7,7,2 and 0 respectively; the second part has 2 digits, 4 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 137720-42:
(8*1)+(7*3)+(6*7)+(5*7)+(4*2)+(3*0)+(2*4)+(1*2)=124
124 % 10 = 4
So 137720-42-4 is a valid CAS Registry Number.