20542-98-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 20542-98-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,0,5,4 and 2 respectively; the second part has 2 digits, 9 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 20542-98:
(7*2)+(6*0)+(5*5)+(4*4)+(3*2)+(2*9)+(1*8)=87
87 % 10 = 7
So 20542-98-7 is a valid CAS Registry Number.