42742-18-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 42742-18-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 4,2,7,4 and 2 respectively; the second part has 2 digits, 1 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 42742-18:
(7*4)+(6*2)+(5*7)+(4*4)+(3*2)+(2*1)+(1*8)=107
107 % 10 = 7
So 42742-18-7 is a valid CAS Registry Number.