77940-21-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 77940-21-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,7,9,4 and 0 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 77940-21:
(7*7)+(6*7)+(5*9)+(4*4)+(3*0)+(2*2)+(1*1)=157
157 % 10 = 7
So 77940-21-7 is a valid CAS Registry Number.